Malicious PDF — malware analysis report

Static analysis result for SHA-256 690065cd51d97861…

MALICIOUS

PDF

94.6 KB Created: 2021-08-13 12:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63928697f6775ad451a3ab036862c000 SHA-1: 91e1fe9330204333e40cf5c1d04fd422b62d363b SHA-256: 690065cd51d978611fefa9968b85e0239b5ce88823444437b796664e57168358
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm characteristics indicates an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=bat+rolling+machines+for+sale+craigslist PDF link annotation
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/65583060285.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/55810450636.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736c5e8863d---bapemofetipemovez.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/2ee00288c66ee3227e6a79ae1673e5b4/39373175253.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210615_184411.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/mivipavitizerewopup.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715ca33574b---tigaf.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/r7vs9gbg9mv55q4hd08621urb4/51805664689.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6c43c3786---53597584.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa01958a871317dca1f44baab3f34aec/62116487053.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/fd02f2fd0615c388917f66170373cace/nilikupawe.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/16740124513.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/tunojiti.pdfIn PDF document text
    • http://becucci.it/userfiles/files/goxixabonadilexuregavaxab.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/somilizezotesasefepot.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/wezabig.pdfIn PDF document text
    • https://bak.vn/upload/files/99228533725.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ac329165dc33dc7090dc54751036ce8e/joturajigamamuf.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/ludisodavinadamado.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///24527731777.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/81094695117.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/29356a566de2a873a078889fd61aed8c/rojalemukusevibomowunagaz.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/bikujozenufunuboburo.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608122a2db8ba---fedudob.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/dudiwusim.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/tekaxuravemowufolu.pdfIn PDF document text
    • 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_off00010a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001222c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222C 10836 bytes
SHA-256: abe9678161610a594f38e9a49315324b87231df97c0ccfbddc474d75a68d695f
font_02_sfnt_off00013b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B03 18672 bytes
SHA-256: 83633ad444fb46c60d849ca626ad8e38ebd2a675c1ac5f4798bbb42cb740f2f2

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