Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f7a621f28d73cb…

MALICIOUS

PDF

100.5 KB Created: 2021-07-23 16:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae0ed6f2dd227fda233323a68a1297cf SHA-1: 868197bbbdb81ce88625b97cf4f57e45c164d858 SHA-256: 16f7a621f28d73cb9f7fc06b9b58d6de0c75a27b2016f8bd74a9ad7a7cf1a14c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised or disposable domains, designed to direct users to external content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to obscure the true malicious destination.

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://hesexpo.com/img/editor/image/file/78582525535.pdf
    • http://mawaevents.com/uploads/file/99365667996.pdf
    • http://candemdientu.com/Images_upload/files/57856808042.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608345bfd807b---turaranugutazam.pdf
    • http://tamker.hu/userfiles/file/gexufeletutasitib.pdf
    • http://morgancountyoh.com/userimages/6998410657.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/2jf2a7sestq6pc8f0o1tlbb7f1/gopodisanuxinedonox.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b9b5a8adf---goxawefasoluxetid.pdf
    • http://nuestratierrapremios.com/campannas/file/luluzoniximaxiwusegise.pdf
    • https://agmatbaa.com/upload/files/fodaribujofegawujagupixo.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b822e044806---76628872907.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd32f87cc9---vatenuxa.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0a51968e8---26075897359.pdf
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/pemifepapusunutixor.pdf
    • http://mppscstudy.com/admin/usercontent/file/wegivomigir.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8c705f4b8---kikowofopapisejerumivov.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/dbrkp2qg7u23lu84pvrjso1m1m/44313704584.pdf
    • http://tencanpowder.com/d/files/dufililupukesorafukar.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/t8c53uusnnesei1i6i62fm1s9s/kamaso.pdf
    • https://nakipoglugroup.com/upload/ckfinder/files/tunituxutax.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f04732f59---4567273198.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=naruto+shippuden+ultimate+ninja+storm+2+trophy+guide+and+roadmap
    • 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_off0001235d.bin
7e49a11b3dd765a0fa71244c4db379b339df313a6846c4649309382eb115b1a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1235D 11280 bytes
font_01_sfnt_off00013d7f.bin
350b2afaa20c1291d2fe9ec385741653726681d240d8c8bba1f16ead0f4f7e62
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7F 17408 bytes
font_02_sfnt_off00016b33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B33 16792 bytes