Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19f26868fd4ae99…

MALICIOUS

PDF

71.7 KB Created: 2021-09-23 11:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75ddfc89ac7f779113570d7089f9e1f1 SHA-1: a4f286775c0caa04f257399cb719007cf360a197 SHA-256: f19f26868fd4ae99ebc5c7ec54b90fb79278f10b01cd6da4efe2aacc6a4eaeda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, preventing a deeper analysis of its specific intent beyond the observed URL patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://uran-berlin.com/userfiles/file/lunada.pdf In PDF document text
    • http://slesnick.net/userfiles/files/xison.pdfIn PDF document text
    • https://pindimana.in/uploads/file/29140552520.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/tilavopifatejifubemiva.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/mirevax.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/73311074463.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/gagizutop.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16149d756e733c---58702384316.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161403e9c9c1c0---wugatigaxomowute.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/58022942816.pdfIn PDF document text
    • https://unaizahic.com/Files/files/likunodedadamajavelelol.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/xabireba.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/sukes.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/wovanuzebalo.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd8345bcb---gakafogizorukok.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/18643248036.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/jipodex.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/59260242718.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/57361833103.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/18894733056.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/4947129453.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c633be16e4---84047029539.pdfIn PDF document text
    • http://liluby.com/upload/file/21737891787.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/drreqaalorlabv4dps53t62e48/30792731077.pdfIn PDF document text
    • http://turatabor.hu/media/kepibumezan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=an+example+of+operating+system+softwarePDF 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_off0000b7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EA 10984 bytes
SHA-256: 860fddc07ce6448e5a4949a6a7adfe46ede78cb70e527b8bd7acc84ee6db0f4f
font_01_sfnt_off0000d181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE993 15452 bytes
SHA-256: db4973af91b148bc3dfa72b31994c98662637c9e5de7510dea6591150f36c9b5

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