Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a64048f24d7fc2…

MALICIOUS

PDF

131.1 KB Created: 2021-07-21 08:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b6440abafba0921a49fe534ba60a132 SHA-1: 2f30625a00d1abeafa49a6b581b6f0bd647d3f0f SHA-256: b0a64048f24d7fc25f9a8055e01b67254135d7b15e8921739763d170aa784549
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 CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure suggests it's designed as a link farm to obscure the final malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/c6140irk8gufufkcbcl8puieds/xajeveb.pdf In PDF document text
    • http://thuduchouse.vn/pics/file/pumapomupeworomanavuf.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/88f28cfc418f45b6dc38d4a88ba1cb80/vugumavuxena.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/7kpd3q240v10bjimqohjqk4dg0/37630074698.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/67962964972.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/58970379553.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/78561671696.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607654c8d584e---dekalevu.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160778fa7c7869---kifugerosidubolo.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/6570627391.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/negopoxifivafiret.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093a37a8ffac---70787788710.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/9fa866e3225ea2d40a36b067af3b46de/1016748036.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/6i88nb7ei442r1j7mtdvlt342c/33513489173.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/reletolikeb.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/vuvamudetuvos.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac87bf9901b---80811594692.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/sopapaladuxukapiwij.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/norutesumijukam.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/43331757233.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160940bb1c6dad---9491689394.pdfIn PDF document text
    • http://dhf-china.com/d/files/36132330335.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/91280751570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=flowering+plants+and+non+flowering+plantsPDF 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_off0001977c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1977C 10736 bytes
SHA-256: 17179c4de44132449ca9ffc75284d100ea73790778f712f0ea6c8cff81a44b3b
font_01_sfnt_off0001b025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C837 21308 bytes
SHA-256: 8749897cbca30b36971e8bf2d7f894d1fd0a11004fb0248c0151f167f4bfea59

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