Malicious PDF — malware analysis report

Static analysis result for SHA-256 499248bb75f35526…

MALICIOUS

PDF

158.0 KB Created: 2021-07-03 04:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a22942533e8d3b36995c2e3425ac78e SHA-1: 7e0d97e1d55cbf578e99901571a4794e3a640cc8 SHA-256: 499248bb75f355261f03754574d80cb1972f92f539ab1e5ad94b55f54c8b2d6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and is identified as a link farm, likely intended to direct users to malicious websites for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to lure users to compromised or disposable hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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=objective+theory+of+contracts+example PDF link annotation
    • https://cutandcolorparrucchieri.it/file/kitasovimofezobepibu.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/85920e92c12b9444b31bb34e4fa63768/45542572552.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/lowizeg.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761c45f12d3---9863248026.pdfIn PDF document text
    • http://limoride.net/gallery/file/sizoranimokagewizuwufe.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f292d1e28c---1383393643.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/v9k6tugbmvp3n0aajrfia7h3v5/52226675252.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083a6e81af18---rikowetebafemuto.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084963bcffe2---vusulonibagokadalavuw.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00c9e5978---jemake.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/3010161f41a10e51c31bb8c7bf524e57/bizewezibaluj.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/b1spf15elkk9hdb0cdtk8ck590/1043561080.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/42522408506.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a42e524ef10---seniwabu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a506c562917---86299994416.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cf5d7cb6f---miwuzajufavugiruw.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/wufopomudelezekaretap.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/31142578230.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/13dd01a2a91bec6e986d24e5faae39dd/jopufepikamixevubegezaj.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bca0e08e3---tizevuk.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/mofibuk.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ppub4nqdkvid01bh888o1f3cng/48548309369.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/47823045610.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/74130791490.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_off0002075b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2075B 11324 bytes
SHA-256: ab5d510e36265febea19e68e753ced1c96609aef4c6659ee8ac2d3784b8c081a
font_01_sfnt_off0002219b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2219B 19172 bytes
SHA-256: 5599413b13dc9bca923cb0150bc8d2a0f1079f296026ed7e220cf4a6c4bd0fe9
font_02_sfnt_off00025225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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