Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4a76d53a692cff…

MALICIOUS

PDF

85.7 KB Created: 2021-08-10 20:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9993c50bf6b7fd5fcc5f4dca470a6a6d SHA-1: 91b602a499eac1bd2321bc193c1ac3c8bd986770 SHA-256: fc4a76d53a692cff5b9db0ac5482484b2dd959b34927a409a0399749a7db9c3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or redirection mechanism to deliver malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to trick users into visiting potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://laborke.ru/uplcv?utm_term=strike+the+blood+season+2+download+batch PDF link annotation
    • https://retrofitoman.com/ckfinder/userfiles/files/27758876198.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/juvazotatojubivijejisa.pdfIn PDF document text
    • https://protrialse.eu/files/files/dimamoxupaz.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/40453700872.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/5dad1bcc5e190d54a5b01c0bb3549da0/30485537514.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e97fe9ef04---bolutojek.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ivbh1tdgfl33pl9btvqh7q4hf1/35603976177.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/g43d6e1n4u2vbcisd5vt3eiks1/45215551784.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/paxixogakok.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085caa7a7eff---xuvejupoxuluzajoduvi.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/737b4dafe8e5f25b401ec7c131bedbb9/wipenizab.pdfIn PDF document text
    • http://vhs1970.com/clients/873287/File/jotifipuwaxuza.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/73197756886.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074280cef584---59899384124.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/991783f877f72bc7d9153c0081adc88c/movop.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608662f35235b---42446414006.pdfIn PDF document text
    • https://electroagro.es/pub/files/lofip.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc4a515389---bulopodanofos.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072995bee9b4---seridoza.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1fb6bc1687e98eef95d1d20b5874615b/74574869810.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/91528397132.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/teposivarixeramu.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/lugakubed.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/59875271840.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC7 17088 bytes
SHA-256: 18825ce01f6e62ea47a27a6ea967d78eb27451a6ba18ebd0f05af09b00348b74
font_01_sfnt_off00010aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B8 2596 bytes
SHA-256: 42f048cf58ece73e5c8df1cb145a8bd6c6ef326536c9e109f680f5d302a172e6
font_03_sfnt_off00012de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE0 10980 bytes
SHA-256: 0711cee6e873e38c653122e01491d2f40bb648f37a25a96b1faabd168e27043a

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