Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1261f60a52a200…

MALICIOUS

PDF

84.8 KB Created: 2021-07-01 12:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 74391766b8e6af8e75fc2f2ee304cb7e SHA-1: fe7b5de3ee91b24de0878c6dc2b85476db2fa23c SHA-256: 4a1261f60a52a200b8b37d02e3ff3b6ee0e8cb2759969d8789dbc209de277358
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, which is not typical for legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://synerhu.ru/uplcv?utm_term=convert+sorted+array+to+binary+search+tree PDF link annotation
    • http://banlinhkienlaptop.com/userfiles/file/89474002191.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f18d73b71---medokuge.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088671a65fc9---jobiguvuto.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/bcb0e7770b1e6624f0b1d14dded8c626/buxebaruvonelexafive.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/309063655.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/96516788334.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/qjmoav2j45ivrdbb74ch9jvhav/6717981592.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/mozakumo.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c1ce0bf67---60006002355.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6a470655c---66461690116.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/xisoxi.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b067439fda9---43451734499.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/fijofodaboba.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8553827f92---11161232889.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/pn570j9d6eoom38j9628r7uka2/10718152458.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092e0e246a05---53900203985.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/98331354774.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/63936588431.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/0mnecnjit5n3bes9nlgsphp582/xivusitesenosunokikil.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/likazixewunopazaxoxejese.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/rowatubojomasapejeb.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/gimurajizonisojebo.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/zuwopifirusofa.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/50034acd29c7cad883b864cba5484c11/sojalenumiji.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/48709423607.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b775d921394---wipojanaxoxizijugixamaga.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 10772 bytes
SHA-256: 555ac441d88bb3e714c3d40a8c15b6ea9609c94db7a4ef1ee21be90fa1a57a47
font_02_sfnt_off00011601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11601 17924 bytes
SHA-256: d56d9abb6797bf543330a93946c5a667f1503e65e2aabf7e110cf2cb3adea516

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