Malicious PDF — malware analysis report

Static analysis result for SHA-256 1237ef52d9abfa84…

MALICIOUS

PDF

109.8 KB Created: 2021-07-14 10:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 96c3b698e1d0fffeb08c23fd787bdf05 SHA-1: 887428713ad6c9679b6cce10cfa43c8f42b73787 SHA-256: 1237ef52d9abfa8470d5cabea46d20faceb86c88232cd7e010016109e0338392
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting it's used to host or distribute malicious content. While no scripts were explicitly extracted, the nature of the links and the detection suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6337

Heuristics 5

  • 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
  • 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://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160986f7d442f4---satoxuxakojamabu.pdf In PDF document text
    • http://musicpark-live.de/userfiles/file/wetekubaxedixasupeb.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/9d71hh2qq49i3bmc50aqt8krr3/72924406775.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/qvk840aco0gm3dt9sbr0r7k314/tidinatabupakesosoduxubub.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/41946590881.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc62e83f735---81135063748.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/39166263543.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/4c3af348c153dff7dc20d68acc562f23/nonezurijusojubokuju.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765d570f137---lixarulisun.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d485fc510c0---baxovasenok.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608621c997f8d---57283764152.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/0q4ruse9j5ppth2a5b5kqsjmj3/jaxemonujumo.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160cb02ed3e43b---27998306406.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210630105100250765.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/vupulipimuxavinin.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/22327e3bbdbc21c4e4428c7e331d1909/kunulorinenimewozit.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/36329742394.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/bimuxofopagi.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795a2aec5cc---kekuxolarulitepejix.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/0flo00sa84h1dr2lgaesoetgkb/78527422926.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/xisejodiwoxi.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/310158528964.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/zezagetu.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/lovaxomixuw.pdfIn PDF document text
    • http://trhs64.com/clients/c/cf/cfad56e582d93fa9eda51f2516e23bdb/File/6782679624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=palm+fringed+beach+meaningPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B55 9528 bytes
SHA-256: 1f587bffb409cb7aa2fe1f13f8e5d8f6f39434220749f6ea777eb57bfa8486c1
font_02_sfnt_off000169fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169FA 18348 bytes
SHA-256: 103d391db9ebd64b89ae9f8022ba37da8c72ac7b993ea595bbb056eb40db1125
font_03_sfnt_off00019a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A6E 10680 bytes
SHA-256: c072d488aff549e995fa383cc0032f4da92d7b907c0359472dc0519d28dd0b46

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