Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf2161e7916fe83…

MALICIOUS

PDF

81.6 KB Created: 2021-08-27 02:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d9cbdbb40ee456913d4dcec2c436b29c SHA-1: 6d09f6eb1f55be4ee7574df5c1db5c23c8e5c246 SHA-256: abf2161e7916fe834d144194185e0f3f5f8acfacb33a79131ac680d01d41a97b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to malicious content, potentially exploiting PDF vulnerabilities or serving as a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090f668bc03a---36466055264.pdf In PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/88840325121.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/zenelajugikulawurili.pdfIn PDF document text
    • http://esangsok.com/upfile/files/belexeraropejamotubomazi.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/i5rshjmt0qhhh91lqnm7chgrbt/2798228163.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/23911228482.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/nalolaxigidutal.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6912c8a46b---lasewotarimoxozefotowubaj.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/o7kukh9p6s40l1emgipv19k02m/gegilonewitumobukomixuv.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/9388566794.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/v6r4dnupgdvtubf34k5slruij4/gevugazujesugofalaxipito.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/68646195532.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a89ba460287---zudevafe.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/zixodudove.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/41369214142.pdfIn PDF document text
    • https://kaimano.it/file/83484572021.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ae51bffa0---89337699145.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/bgfd46dq2uuba6un6202e02s7c/28185029454.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ff3d3d74b---24036264997.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1624719592zasigijoli.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/87899838898.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16085ce2029ee8---8420080623.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/8ulkt1e0cfggjrgdpoq6aa0qi3/53936294446.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607275aa15eb4---tapodere.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca71c38373---19431991850.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856ae4da6d9---62996915303.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/19106008012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=paper+plane+template+printablePDF 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_off0000de1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1A 16348 bytes
SHA-256: 6a1f3599fb3db861ba20f04f29c90e43008951d4fb5603fbf622d4a7c5a652fa
font_01_sfnt_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D3 10264 bytes
SHA-256: 9079303bc4e4f125ab66cb3ceda1511d95d9479e7a80dacb9373acb3b1ca6f39