Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fff1513b20a128b…

MALICIOUS

PDF

68.6 KB Created: 2021-09-05 10:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e549f5102b9a569053a23f051a35c653 SHA-1: 0c983336264c05c171cccdfcdc86022f193614d6 SHA-256: 1fff1513b20a128babc9d61c924717223619633e6318ddf94c27a8b7a5d92ee4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krossi.ru/images/content/files/lafapepo.pdf In PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077f4a2d4d99---43620433081.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/39833549745.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/lo1q9ju8iavn6qjbl0ktabk3rl/gojuvezaguvobam.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/50671163364.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/18903940907.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb60b153fc---2054412710.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/vopefonifelokepasi.pdfIn PDF document text
    • http://imi.vc/upload/files/91778895535.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/vidifepawuwonodiz.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/47272689582.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e61cbc8cbcf6214e787e7c0f0f582d27/bawatomabowezavunonotaz.pdfIn PDF document text
    • http://2440027.ru/upload/file/tapisufipomiwa.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/28431792804.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/27908897868.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8878fa6d21---bapumevisedimegojuxonet.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/sotinagobokiga.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e815a8f6d837f3a717634f3337fbaf24/xivobemewojabuxalusona.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083163009ef3---tevaruxide.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/91557965540.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/56676691807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=suffix+ed+worksheet+freePDF 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_off0000afd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD1 14752 bytes
SHA-256: 5914a0514b75d6b358ddc1722e286f0fc1ad723d34c840085e4d0a06e1bf2572
font_01_sfnt_off0000d501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 10596 bytes
SHA-256: 7440cc34a9e47f4b295a46ae58b66c189209238a08de87411d2fb489140a867b