Malicious PDF — malware analysis report

Static analysis result for SHA-256 2265f2cb2c75f4c1…

MALICIOUS

PDF

178.6 KB Created: 2021-07-13 22:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 14701f3099c7b815bbab461f0ad0dc22 SHA-1: 9db82f73dd1e6279f495db1c0ddf19b54f3a0795 SHA-256: 2265f2cb2c75f4c194ea1b3d570cc0d8544becbe08cbd8b9fa29e3b1c10799ea
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites that host further malicious PDFs. The document body is unreadable, but the heuristics clearly indicate a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa05eb72dc---pobofokufejaranosimolo.pdf In PDF document text
    • http://www.deco-interieure.com/userfiles/file/dugazevufirofum.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/05d8f1972094e70777faf532601ea247/87417887816.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/07891d2bdc35aad0968e95d3c3f6ea02/9951990156.pdfIn PDF document text
    • https://sankohomestay.com/userfiles/files/pipagikenefitomifedum.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/hac2ncss2aq7hdsitkjui7bn39/gofazuxazadigorop.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/56016856993.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16089051354583---nonov.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a767c35db03---93018135963.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/23104525535.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa73c1a53e8---31899567635.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/6gtnpgk51g9i5ls4o4oo9mhg93/42111193828.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/23091237795.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/bf07skpkkf98u8fdh0mdt4vg8q/10489086849.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/rikanukudutowabos.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/91177889445.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/91925894056.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c28878b381---7025590789.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cad2536ca---39704804601.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/vuzifegonobebi.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34a5384a5---79089953259.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b4661fa8dd2---kuwuxeriba.pdfIn PDF document text
    • http://amandamaitland.com/images/file/kovumorutojapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+particles+in+gas+movePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4d0e4849b7382090456d5234cf293b47/logugegejezudenaritaseme.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_off00025b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25B71 18632 bytes
SHA-256: 9bc90bfa08278ae7f70e87436777a4f5150ceaa1300debc27265526d69544672
font_01_sfnt_off00028b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28B16 11000 bytes
SHA-256: c2c514cc8c67b2fa89318fe4c63e26012148aaf58be22a7c70fe60270c7c87dc
font_02_sfnt_off0002a471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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