Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22556aa80d06d9a…

MALICIOUS

PDF

88.5 KB Created: 2021-09-03 00:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a4886cf176bcc17f3f686fd34bc51b08 SHA-1: 1e3d95010a1a9aa7d3bffebdc91d3de4dbaded8d SHA-256: f22556aa80d06d9ab3dc2c9c079563851b4b802fe8950849c799b3223ca3d006
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely intended to lure users into clicking malicious links. The document body is heavily obfuscated and contains no readable content, suggesting its primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://e-store-sys.com/userfiles/file/13692738653.pdf In PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/37ecc2c1ce6a50250ea7f49ae98325d7/42759481754.pdfIn PDF document text
    • http://93564497.com/userfiles/xapanefi.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/llej7qk11iik0ngaegf5841192/99351397218.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607081ab14e9c---2737345065.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63fd02d53f---3610132890.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/12741101794.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/36620764730.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/50882869477.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/nevigopejol.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/56374209065.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/2177666174.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/87017881485.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/wapopipozixama.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faf30c0411c---17138589825.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/minabomijiri.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/r3bsv236npd9kbt7vn08f7bpha/72426161862.pdfIn PDF document text
    • http://trhs64.com/clients/c/cf/cfad56e582d93fa9eda51f2516e23bdb/File/tozikumazufuj.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/56642390941.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/juvozatawosurobezat.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/fenulatevetegidokofosexud.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/sevubotaravuwutik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=bpmn+manual+pdfPDF 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_off0000f5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 10100 bytes
SHA-256: eade131e0d3c3cccec25a538768b9cc0f1cdd64f86b0af5195cdd3dceee49fa0
font_01_sfnt_off00010c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 18616 bytes
SHA-256: 601a39fb88e5dd05dfdaf46d834d7da26bc149491b9d8416c10ce14c5c1f7ebf
font_02_sfnt_off00013c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1