Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c973b42588a711…

MALICIOUS

PDF

88.6 KB Created: 2021-07-19 19:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d61d8b001e13bc00f12fe65cb97d939 SHA-1: 69fc4a73523d4baa1051af2860de494975f7694f SHA-256: 28c973b42588a7113d456c52ed318ea995982a72a45c45dce8c200aa82902e4d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous external URIs and the 'link farm' heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://propellerclubsandiego.org/uploads/files/kexekerimexumanokararifu.pdf In PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076090e776b6---63019832578.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/renamudosux.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/1k2bml3isljr6jpuib19jhb94d/ponefopizajekijepaja.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/4497745468.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/gilofipuligeb.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/3530c50eb2b09000be1025cfa47a45ae/41883740687.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/c02e61c208d97360a9d2151b3e4f6a27/zevuwisewufapisake.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/50211036328.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/2ijnbg66g9fjc6psk6r1fmaq1u/xowunororebopinufofo.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/84014180459.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/97217677987.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/8f7e9012c5b80c779849bf78a816c595/76358277583.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/355982fce2ec9c067d1ed30e451284f2/42024556022.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/boninijivuxexuxeretamurol.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/bqhaadb1lnj4g1ba09uiroc06l/14587074693.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a8060570eb25738dacbefa2c418a6aa3/32562425927.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16089eeeef22e6---41402435108.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e77f0a929152153687e1840244f00828/fogob.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/dt439i3mmppkqvlrmbl25ps46h/kibomofodogozudofonez.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b551b2998e---xexelavukeritovo.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/91003313638.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/2jntv34vs7uiu7fbp49ok9grt3/dodinowibaboxekawowabara.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/levidedezaganeluve.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/paridogimomidowikulomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=highest+paid+environmental+lawyersPDF 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_off0000f657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF657 11096 bytes
SHA-256: f7c91f514632c644890265d1c3037e49b0eb6f649542f1f4a7841f67f202a001
font_01_sfnt_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 17308 bytes
SHA-256: d508a4186c8dc4c54b4ae2af3785f382929925fe09ee83e8d38997c8ee1f650d
font_02_sfnt_off00013cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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