Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab72bfea7d8f48a0…

MALICIOUS

PDF

93.1 KB Created: 2021-08-11 02:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 234e6fa5698f6b700cb412a88dc3470d SHA-1: 10f6f4a80763ef82ead5f1c7d20328ca59b4da8e SHA-256: ab72bfea7d8f48a02b64081f010590bb164260e2996de674c5f3cecd2365c2fb
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress uploads and other potentially disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary purpose appears to be directing users to external, compromised resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://scro.ru/pic/file/93669639800.pdf In PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c1b99c958---69606746585.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/bevejunowipapagolajareba.pdfIn PDF document text
    • http://belst.by/upload/file/siwagututudisasaturamogi.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/4ukg95g6bpkfb0dg9pqd2krpi2/40326411726.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/af47ee5dc2f4a822b448a29e58090ac0/21578294234.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e1bb82b97---34317605277.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/96763613910.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/votikufuzebawok.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f000fdb814---gawidajaxejuwixivule.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/negobajowuz.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/e17f09ae7fc429633d560154ffc649b7/47811910082.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c13bcae4fde---26131937553.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/5968545009.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a5fa87984---duzirileg.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/42463590723.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/dudusadomozat.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78240ebc66---bepiwi.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/77296421904.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/7d51cec0785727d727fd374fe8312ee3/kunozapubafamasovekexi.pdfIn PDF document text
    • https://kiameds.com/images/upload/files/18636282981.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/40224700614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=abstract+noun+quiz+for+grade+7PDF 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_off00010738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4A 17484 bytes
SHA-256: e72de5249c8dd49201dd5073367237616a7e2629e5afaf9ef1af2ec97120d613
font_02_sfnt_off00014cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF5 11084 bytes
SHA-256: f1e8da3d8301ece3ab3876bb7f84a6a82a9f78b49da5b888a5c3e38901bb57f9

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