Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c51c70fd8b534e0…

MALICIOUS

PDF

90.0 KB Created: 2021-07-31 04:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8ddf772a312ab10956029df2280eba18 SHA-1: 3d95a1a7bc895520f2f3dbada842b7bcee7158a4 SHA-256: 6c51c70fd8b534e025f890447b217987136380d240a171a36958179d935d6623
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress upload storage. The presence of these links suggests an attempt to lure users to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a41a4bea2d20a27a721153e07bfa2daf/96234300800.pdf In PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/ziwenovovubonavuti.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c562adb9ef4---sudekepejokaxodiw.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0152244db---4562962744.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/39572019481.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/91628397611.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607465ab507e4---gepurafimoverebotewijoxa.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/27568681417.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/dadoper.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/suwojatize.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/98016592820.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/gumofaronelimeji.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d49e1cad0c---63209819875.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78869986320.pdfIn PDF document text
    • https://qnzar.com/files/31136751490.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f587b922---1778457446.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/5554d815fcaaf58e83e80c411665ed80/16039381655.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088b2bd62dde---mapifogekarujuj.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/jozonozibasivusaxobe.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/7579856476.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/56493813011.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/dorevabipiwedavug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mechanical+drawing+board+and+cad+techniquesPDF 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_off0000fbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF3 16884 bytes
SHA-256: cda390aec5466e345c07937bb09ab89f1b800f6437a7c9d53374e5fe0ea4ed77
font_01_sfnt_off000127af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AF 11116 bytes
SHA-256: fa4de9b54dfb63168fec21892f62c6af959f864ae2ee854fad9640557f741c4d
font_02_sfnt_off00014113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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