Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b12c109de140d55…

MALICIOUS

PDF

82.0 KB Created: 2021-07-02 19:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 323e97c471e9076aa3705a386ab7e8a1 SHA-1: 53e82741c95a7c2c63cb9ef3a7da55b9b9f35d54 SHA-256: 8b12c109de140d550840d1ce7c2bc4855c1c36800935fde73f143d7ee301ced6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple compromised CMS upload storage locations. The primary attack pattern involves luring users to these external sites, likely to deliver a second-stage payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb5fa9ff9c---midukideloxojemu.pdf In PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a3b4d17bd---73469541341.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f477f70e89---manopegojonexutajelulabiv.pdfIn PDF document text
    • https://activepymes.com/pub/file/86654245458.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/24275304669.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/o383cm0v7kha5hpfte17pntsig/92795089723.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210608011829.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/85ec5757819b8ef2c4094749bda6e60f/gezobutetolan.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/55163999359.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ded590ec3---1218007783.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/kewivugagukajux.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/59a2af411e4de49d1bf54fbc117b613c/wixeso.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7c5419ed---mifepopanutewafonijuxil.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607311b718872---kovogatuxixuvamije.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/76eb3jh02il23bjr6ub6qvqv53/17451465273.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/2671387160.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/0a5e8220238b3c57db27433aa02f9bfa/jigerotejazapuwifevip.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/37283765646.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/wanurimajuwumu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2b6e928e71cd480d66b081555e940156/lanovelumokojixezulavekaz.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ba755f25ce8---38140299754.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/50685882155.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/1dr7ipltpn3kj39e12rbvrj04g/niwemetonomogadajud.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e631b66c21---23497914282.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/lugaxezarisilogugijewezu.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4bf7aa8d3---pugalutovuzanoxezor.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/fidezobawofopubiwuwinobo.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/kuv4gnqobgbvuoesui34oiu3pc/voxotofekagajiwijuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=energy+stored+in+capacitor+derivation+class+12PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DB 11024 bytes
SHA-256: 18ec74d1834751474e1c95b712e5e238b44d5dd86ab3bd7bcc2e3454c225aaa3
font_02_sfnt_off00010c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C88 17484 bytes
SHA-256: 52d173bc72f6b464a356730b503df2047b13cdf40e6be748d35138c5e9d86f80