Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2c1f8f650cce9c…

MALICIOUS

PDF

185.2 KB Created: 2021-07-07 14:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c592d5b5e35b6edb48e62ad9b0de6084 SHA-1: 557d4b41e292a29a59654e307f850480d285c215 SHA-256: fc2c1f8f650cce9c505a9429d6265d1ef9b94c8d7a2125e49dfd0c816a453477
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs and link farm structure are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://irlanc.ru/uplcv?utm_term=vcp+7+study+guide PDF link annotation
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/fca0253c4b11369b52efa690a8a53e43/47002211163.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/e1a9d37d8e1bbb0bc93bdb775ab2b487/58220926628.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8aa54bf1---simigipo.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/lefofuku.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dfde1541bbe---tesizumefi.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/65863070152.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/aa4b6acd114b6e8c815262e4e403b62e/72735891316.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-7/20210507142820691453.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/7b869dcec48db12876780d6836ebf77f/leguturulamawapudine.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/guzumodifelokixenolil.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607585bddfdf8---93157543561.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6a8c85de6---17184047901.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/4e87a52dc550e7dbdf59eab2db74fedb/22210327461.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/12438571260.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/8410224345.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/90443739380.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/9tlraerub30ivqrkp1m5qcu4vn/58034808880.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb5ec28a09cd1e9d07126547a8acdaf8/83203311668.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/i4tbii32vud1ci8r0fn8gsnl01/fuwamoxetafipezuxetewegu.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/c7cef60d2a3dad342258b74564958b93/50875348540.pdfIn PDF document text
    • http://buckleyfamilyofdarling.net/clients/0/01/017bf228c8331327bdfb67b1798bff80/File/18346670262.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_off00026e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26E6C 10392 bytes
SHA-256: 0ab025fff9ef0c4f183df6d0c3ebc4210b75fb4ec66fb7dcbc10208dda2844f1
font_01_sfnt_off000285fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x285FB 22120 bytes
SHA-256: 7c3ccfa3148aed02095ba41a15ac524c7fe72e60f19968f4e7fd860a1ce2667c
font_02_sfnt_off0002bf9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BF9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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