Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0da5c93065d121a…

MALICIOUS

PDF

90.3 KB Created: 2021-08-23 12:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9a4760d7f3b61cae849e47221f36d4db SHA-1: 85a4b8a986eec9f64286778b01122a2166ecf6db SHA-256: c0da5c93065d121af70796d8cd7e63b31feae8c29573cedb702f3d60a001edb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised WordPress sites and disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous external links suggests an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://xtra360.net/campannas/file/rixefobo.pdf In PDF document text
    • http://broeinest.org/ckfinder/userfiles/files/tolevunubitusawizeguva.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/57928580729.pdfIn PDF document text
    • http://clingac.com/d/files/pavisu.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/lefewebiw.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/21611522092.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/bozefosobasum.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/j01v9t627sudgeclssl1g6sj1o/9132238069.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/10748233341.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb41917d62---mijefisorokinabibejuzoke.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608118f54d8e6---zuxewida.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/80619353440.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/27468637650.pdfIn PDF document text
    • http://atek-ent.com/upload/file/33134096752.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/7ui95e6uassdibb8i6r52cpp1s/14756319044.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b61c9bb47---4761194530.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f3485765---80261603363.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/loripideredazenubita.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/12256508072.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/41486371571.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/ketubigojebureg.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/xosasil.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/nijofa.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/pe4h06a7kkcodlh8dct1ik7jah/72046984997.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/13982430483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=blood+type+complications+in+pregnancyPDF 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_off0000fe1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1C 15912 bytes
SHA-256: ef8f725f3c25d0aff493e5846204d452005ce21c5576bc7db151e6ec0435cdb8
font_01_sfnt_off00012732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F49 11024 bytes
SHA-256: dd45c43e8f6872236175671a5f470575d53c4ed34d09a30f2731aa27aee8b240

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