Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a97be5d1315e2a…

MALICIOUS

PDF

75.9 KB Created: 2021-09-03 03:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3dd2e95fecccfe376d7d3f18a9700478 SHA-1: 8cf608cc58b08be62cdf43f0056c310d7e3ea3d0 SHA-256: 72a97be5d1315e2a6de2c79ed3c7c2662d5778ab41959bc5052519ad453bf47f
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 point to compromised WordPress upload directories. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm on potentially compromised infrastructure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely serving as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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
  • 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://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/lfjmv8nr8qhtaqnm2jgk752lj6/37050354846.pdf In PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/4b5b612cc12f51a7ffecafebada445d7/40920767521.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f7febcd06---68523320966.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160987d0b7bdb4---6095834598.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/97860606828.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/lejofuka.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/k0imnvg12f58tru0ib69nl85o7/68573397059.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/adfmbft111a0oc6iepe2pck150/65115924949.pdfIn PDF document text
    • http://grimastone.ru/files/guwikiruwinebe.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/79259860632.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b923a6c36---wijedapogegivemofo.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/72358352704.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/20807065181.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/ljd6r966jigchjnol4fok5o6hu/97004860644.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612079dd81401---9640712205.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609839b14ec45---momevifigifasumuzim.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/84ec02355b7f2adaaf563a99583ff9bd/97309755706.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d5cfea05b---96061481324.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/93150704747.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/dinibivutijibitijutu.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/lisiwesebenixuxarafinew.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/88d8d56cb9389b5df3a482e29287404a/69342671298.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/firininirojexelovel.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/3153291045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=micro+kjeldahl+method+pdfPDF 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_off0000c446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC58 17420 bytes
SHA-256: eef44788e66d86c657d2eb3095d079df6dd9860f699fedb0ed16bfcde70f0a99
font_02_sfnt_off000108d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 10828 bytes
SHA-256: c3e7237fc13a927401796ebb51fc91188c48a32d8cc2ba75ea3ee826d7d64211