Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1ec39b3750c673…

MALICIOUS

PDF

81.3 KB Created: 2021-07-07 15:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 10755e2d898b478283c716347dd6b8d4 SHA-1: 929550059ff12c203bfcccb10ee4f922a26e9f68 SHA-256: 8a1ec39b3750c67382516883421495111b6eb0a28a1b86e91245043936867c14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, directing users to numerous compromised WordPress sites and other domains, likely as part of a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://oniceh.ru/uplcv?utm_term=class+4+evs+book+question+answer PDF link annotation
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607340749359d---97886610145.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b3eaf1d32125edd8201983c565f86b0f/vuzitanetemumukulomurix.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a64bf67ab7a---xuwusaroz.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086f6655b3f7---vejazalaziwedabuzozi.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/40311112861.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/vofilulorukosu.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/gadufoxokide.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/38285553374.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/91116001699.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d4cj10uuvnv9gtcuk0mdhbtn3/kilawoted.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a931db6020---55046502936.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b993ebd9e4d---lajopowimevowiki.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/2459067632.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/87023064120.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/85857025956.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b5273816a4df0ce5a037c7aef0e18d03/rosukamurapo.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/76613994909.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e482bae402---ganetaxoxalunuzu.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/fixonedotuxu.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/nolufiwopi.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/zuvujowode.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/999aa8684543bcd12610090d67343109/giruwu.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/43404506139.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a41a211f39---1368526205.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_off0000d7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B8 17344 bytes
SHA-256: efbc08e2fe9f884ef8af835458c2a987bab3ba2f7d5d7100e59c088eb1169cc8
font_01_sfnt_off000104e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFF 10840 bytes
SHA-256: 34b10740a15d2e176383adb66487b39ef7c2a29cebe41f53c35cc186820c9ffd

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