Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f81d57abe7a710…

MALICIOUS

PDF

87.1 KB Created: 2021-06-29 08:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3dbf2b55e4b24c84da1bf6a9fb9cb48 SHA-1: 0f7733d3f8370758c5042b3315576c8450b4b5e1 SHA-256: 22f81d57abe7a710eb655db347c9cf8e3cb87f2d0b7b2348324a7f6850c82829
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised CMS upload storage and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The PDF's structure and the presence of external URIs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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 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://goteneplast.se/files/images/file/vexanejodaxumebarulewa.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d11cb5f579---fukizasubisedeweboxa.pdf
    • https://dermatologie-francophone.com/userfiles/file/gawidoronelozegi.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab9fbe989---luvitozikeroritut.pdf
    • http://zwickerfoto.hu/_user/file/wotelupezigezizeze.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ndt62724t6ja16fhadea2asror/41767959114.pdf
    • https://jotekonybakterium.hu/userfiles/files/31890496844.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/7b6adaa7015b20248e257791e55703d7/jimivaxisogosuzovuluzazum.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/fa50eba1968385e2169ddcd9a8917375/befowanamo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940f094d2ad---temekoruxopufoliwose.pdf
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/89737851388.pdf
    • http://crosswaysrecruitment.com/userfiles/file/52754124325.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa03e159e05---memizaworawarud.pdf
    • http://londonjip.com/userData/board/file/77413218349.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/3d890e0ed37b7ecb3cb269786b7a3ff4/kudatudasijufan.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/92n2soik5toe99mq9hdf6kjtbt/617178870.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b6862cccf---31967482213.pdf
    • http://planbmedia.hufiles/gemosifujemogudipem.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/9879518635.pdf
    • https://pharma-tools.eu/galeria/file/posil.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/4f5daa4de97d8fb694781a8382d9c01e/78656064059.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768cd3a5d83---90733723229.pdf
    • http://pileshoppen.dk/userfiles/file/72299460848.pdf
    • http://smartvoicecom.com/userfiles/zajotegopa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=bible+scripture+for+healing
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed37.bin
a9d4e05b67d25e2ea8c416f097f54ae56e340bc0777088c9178dbdc8aa026125
pdf-font-stream PDF embedded font (sfnt) at offset 0xED37 17940 bytes
font_01_sfnt_off00011be1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE1 16792 bytes
font_02_sfnt_off000133f8.bin
8f0a728c6d04ecab77bfb186a5a3d95bd0ce9bad768e7850719334543d8812a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133F8 11052 bytes