Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb736f50daa96830…

MALICIOUS

PDF

69.4 KB Created: 2021-10-04 09:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3d4aea4b82eb3a2261ba8da6029e3978 SHA-1: a0b2ac62a7e91b624ec83d3bd7b45ea791fafbf1 SHA-256: eb736f50daa968308cf4eb92f4633b6a8772b073e31a2353a856337451a59ef9
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 numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://photou.cc/ckfinder/userfiles/files/22917686873.pdf In PDF document text
    • https://vasantviharproperties.com/userfiles/file/lagaraxabe.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/75950930490.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/87639927105.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/19075410221.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/87064123472.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/junudomesimofegukod.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/c96aadbdb98d85d006d61cedb9a8d3e0/tazudofulurilag.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/nojosudimunup.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ca393e7d12e505a4e058f969c9438381/2097626497.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/wixowekibojo.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/e6a3fcfbbc2dde0b0e2b1fbd46ada78a/48207896338.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138db6907158---lorudekagopaboxuradi.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/89198096025.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/9ng8tgnv5iff111mgsgtobdil7/42305520437.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/lirirotafoluzasamo.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/83625423850.pdfIn PDF document text
    • https://casaalu.com/luutru/files/40399733666.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161315433dc420---17124915453.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/58851691143.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/2648840794.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/61019897572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=general+osteopathic+treatmentPDF link annotation
    • https://easyown.ddproperty.com/datas/files/nibafukewaniresa.pdfIn PDF document text
    • 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_off0000b1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EC 14952 bytes
SHA-256: 9a602538895b485fcda5882530ed112182385264a8e09d689cce0889ac412a7a
font_01_sfnt_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 10680 bytes
SHA-256: 9d7e16eff919d2a3bbab5131f11a31411a9d1c56879a746420dd7dc04d4a50fc