Malicious PDF — malware analysis report

Static analysis result for SHA-256 c461a45b63401132…

MALICIOUS

PDF

85.2 KB Created: 2021-07-01 11:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 58a10ff254107bb28c2f3b6df4652b32 SHA-1: 57600f98f22fb521be5c4dce563f12cd71d603d7 SHA-256: c461a45b6340113228ee65530af0a762580eaebdc140672a9340fab89bbe00e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated high maliciousness. It contains numerous links to compromised WordPress sites and other domains, suggesting it's designed to redirect users to malicious content. The document body is unreadable binary data, but the heuristics and URLs strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078b8c4335e4---20462348582.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/mabopodiposod.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/69123120233.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/vazidewawawifufumuris.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/jozozokebosibiwikuk.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bfa5717f9---97720274815.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/88537150468.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/zagovax.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/bbcaa71d3e0170b59c96f0b13bcc7ea0/88986677383.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/48137596032.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1bcb99644a6706b9a5b871ee7871e45f/70062021627.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/gurinaj.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/1f73b0227bc9ab8195ff2b61a777fca1/95242213445.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/85465174922.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e73230e740---35275523180.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd634e941f---dusetukojukotoxesu.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/71256815152.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/91586990709.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/556814db8dd583f740a3dd904266829d/82838433875.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160983bcf21d58---17186899639.pdfIn PDF document text
    • http://runo34.ru/attachments/file/paxevu.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/laxowolukirexoxanibowuwuw.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b7abf1925bcad246c0a5c50f53e8f48c/8191442074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=feeling+sick+and+clammyPDF 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_off0000eb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 10576 bytes
SHA-256: 06d276ad8b23ba5e1d8d4895612019354d15a2a03cac5303f6418fa3a467f1c8
font_01_sfnt_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 17196 bytes
SHA-256: 055e901ccccda58548a46d4749c5094d87025565de74a4455e3f4673b9a53b54
font_02_sfnt_off00012f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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