Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1041a3ff2dc1b7…

MALICIOUS

PDF

218.2 KB Created: 2021-07-13 16:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0df22c6b70d9520fd0bad87694db7aaf SHA-1: 8a168efba588654f21b1a398304bb9b71eb23680 SHA-256: 1f1041a3ff2dc1b740f71e9ede8841fd25f83ace3aa633b03feefd78e4049df8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or credential harvesting attempt. The presence of external URIs and a high number of distinct hosts associated with these links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9808

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.
  • 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 http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d4773ecd5---36484969130.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-6-20/20210620134426544341.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a743c04157a---ziwebabisuvevawote.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e45b1913ae3---55927087296.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/a4d57c89b5616e05a7e0e5d5d236a3c2/pijixut.pdf
    • https://jyapa.com/jhuoyue/uploadfiles/fadomikabovakigep.pdf
    • http://akcjonariusz.com/UserFiles/file/vepadobusowutabogutadok.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4a3f2a61e---2731738641.pdf
    • http://liffeyartefacts.com/fckimagefile/file/36815580948.pdf
    • http://mynigaoe.com/upload/file/20210516065733.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcc55877c9---tumep.pdf
    • http://ats-dz.com/userfiles/file/2687215359.pdf
    • https://begili.com/uploads/image/files/zotaxava.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e80be444593---10571856142.pdf
    • http://stellarvvv.ru/ckfinder/userfiles/files/10435320425.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/8f24282296b918c92bded02e0632760d/wapibodemilujoworidazu.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/87kvfhfv6e0ugfvvar1q5jqltv/82653951839.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/58921a631db941d42768bafbab571b58/lexivojeligifuf.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49d8ebd13---16783800899.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/38586767475.pdf
    • http://assushop.com/userfiles/assushop.com/file/bemupuxoviluvezowezopowu.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/e8ce0b8da490a389cdb0dc9b2b98aed0/rewosizef.pdf
    • http://stroisvias.ru/userfiles/file/40620410729.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e8296b07c64b5f0091a0c78b88760a89/sotedugarajekuv.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/b0jhba2tk9l7uno6h8lhfcsp92/55453853945.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=wd+tv+live+hd+media+player+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002f7e1.bin
a2d7eebfb1b825fe50f0d5995dcc888374331181f8b56fb45eff0622d1e10604
pdf-font-stream PDF embedded font (sfnt) at offset 0x2F7E1 18424 bytes
font_01_sfnt_off000328eb.bin
2f3f188bde661a0728729ca3110ae020293b30b4cf5ca8e2453507416ee42f0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x328EB 10640 bytes
font_02_sfnt_off0003410c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x3410C 16792 bytes