Malicious PDF — malware analysis report

Static analysis result for SHA-256 432bb716212d55fe…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 05:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dabfd077cb27cdc1ea7784e1d6376565 SHA-1: eadde9d3c74c4c683e0c6159d14f0a0aca473ae9 SHA-256: 432bb716212d55fe70bd9b955b6c29a19c9bce173e5bddacdd0400c97ac24d84
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS upload directories, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://co-wemart.com/careeruserfiles/file/xiwarewevape.pdf In PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/gifovanaburitosuv.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161365a2cbe0ca---kizufodozevo.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75136117386.pdfIn PDF document text
    • http://aven.su/userfiles/file/33907731221.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/nunebamilozirawi.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/mudaf.pdfIn PDF document text
    • https://network-italia.com/file/88387566106.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9c938733---89904385039.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ca4ded852f22b7ea0d1279cd18af1f65/dorozudedejufufoki.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/taxasopovefofodeziwolozaw.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/gusad.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/vedigapigadugi.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-9/20210909175913485231.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/29306907035.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38271737577.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/fajejedowutulik.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210913182831.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/71402813777.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/68a69c6f5513dc26da612ede95e469a6/tikovofuzeku.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/vunon.pdfIn PDF document text
    • http://tencanpowder.com/d/files/35858490203.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3f17ed254ac2fdea82d50e4a691561a/womasejaweletanuw.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/50613512149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=blackmart+alpha+pro+apkPDF 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_off0000d84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 10288 bytes
SHA-256: d718218b758db1cfc8b5932ed9213c547d967201d2a177f0b0cae907aaa61cc1
font_01_sfnt_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001079a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079A 17300 bytes
SHA-256: 4fabec3ae595a467048ad7b4681b848173efc9c6573e4ea14abb0e10c37abf6c