Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a146fd5a64a8b7a…

MALICIOUS

PDF

144.7 KB Created: 2021-07-28 11:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dcd30b980bcce755a63593938336b2d5 SHA-1: e81b7dd024656e6016f97808d08e65f769bf424b SHA-256: 3a146fd5a64a8b7a3b092f5164ed0e963cc0c57f82dc976847c512ec532177cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or hosting malware. While no scripts were directly extracted, the presence of external links and the nature of the heuristics suggest the document is designed to lure users to malicious content, potentially via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7ef581e10---6369757692.pdf In PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/25ea4411997287c6fb9e8404e615c35f/tifiparep.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0a84bfde5---woxakolitovobeser.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/65a2558c1a700d6d57741fa9db754a6b/tewigi.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606da2a1e6174---wobujukugavone.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086fe621a06c---lujivux.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/maraguzukexuwoziwadora.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/da7f17163d686b078ef0f831b7bcd336/pefupirebipo.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9d01a140c---41777232107.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/lanimudinivopukazemo.pdfIn PDF document text
    • http://sdds.be/userfiles/file/7954385579.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/pivowonurinatolijomolumuz.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/g7hud5sn43c4f2eo1ovlhol8pn/fetovapa.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075dceb03f0a---72056681311.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/jjt8gaj8ghri9as13jtsqu5ag0/nerub.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1386a45d3d---95369879952.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/51852546672.pdfIn PDF document text
    • https://raljob.com/userfiles/file/31874185204.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606deac9ac28e---gemetogozovuvep.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2d1f20e74---27935140246.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd10b3408---najubevarazuzuzizire.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/xigadizukerozo.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/vpqs8e1g079hu9lbthmu4t1l34/rakagodetujexepililo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=what+happens+to+murtagh+at+the+end+of+inheritancePDF 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_off0001d088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D088 19652 bytes
SHA-256: 7a946a424741f0327a3a7eeabc166ee9f2e91988a5acf732242930c5e212283e
font_01_sfnt_off0002006d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2006D 11112 bytes
SHA-256: 47fba8415360593453bc6124cf2194971d8b48b69fcdedf0cadce05685899354
font_02_sfnt_off00021a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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