Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90b8437e7ce682a…

MALICIOUS

PDF

98.9 KB Created: 2021-07-30 06:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5ddb894e2dc8a5d15de0f93950f18614 SHA-1: e4c50bd518dd4d947f1be4b242df9466566c5711 SHA-256: f90b8437e7ce682a22dab2e82ecbd3c4c4724344284e406c44af7e617b1da165
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the extensive use of external links points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=residuals+common+core+algebra+1+homework+answer+key PDF link annotation
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cafed3d7fc---vuzijowusogojimemu.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/58141224317.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/48389800869.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/pesuret.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abd9a65f6a---kegulobenevorepanidi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/fubostbuaancv0ppdeabardnse/28841773635.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/13j2urslsnenh947ospkmdq20a/jowezutofuwopedudobigijek.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/441351cebd6b004a0f5fbbb56816d339/99829514246.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/2115712715.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/21863e3c2d38540139e2bb95887660d2/tibugowil.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/ragizebofamunegutimavizut.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cfd4b30a5---80765938239.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/b0a600f0a8142454feb3cad14365d0ba/33844426264.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/47789307489.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/zaparorivibelesin.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a123a2b8201---ruwapexik.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/58932469411.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/22110222720.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160789c7498987---dajasapinuzusoraduzozamiw.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16257160497505.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a17bafdb6c3f132ded98924e6891d54f/jojojek.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/83744687071.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160887c0966051---sodivepebujatuporul.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/vakijo.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/figinobulemowufemon.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_off00011b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13339 18036 bytes
SHA-256: 430d4d04e7f3cc001917ee2a6f825bbbc87523f42a53ca35df93b0e9bb9b5519
font_02_sfnt_off000161e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161E8 11348 bytes
SHA-256: f255ba2c68bdd2c1180ba2798df614278a0f00eed1701585ab45335371f704e4

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