Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c83a93a14f8b7bb…

MALICIOUS

PDF

125.1 KB Created: 2021-07-01 13:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e58771ad5e7b7deb9534b2e0139e05e8 SHA-1: 5f57e5d40187b265750c29be4b9d295c0199fa42 SHA-256: 2c83a93a14f8b7bb2bfd16f1e38e587c62e0ed2968e72aaaa9a7ea050a0d00b5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://chcial.ru/uplcv?utm_term=euclidean+distance+clustering
    • http://porpora.info/imagenes/imagenes_contenidos///99094749308.pdf
    • https://protradingindia.net/userfiles/file/38387188635.pdf
    • http://dataction.org/demo/dataction/media/gaxosuzesalonomugi.pdf
    • http://mwflower.com/upimagesfile///tubaxegasu.pdf
    • http://flynewsletter.com/uploads/file/93132416250.pdf
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/38144796454.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f56ef2af38d019eaf09a8c28116daa9e/32415600281.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/k1k9ahjdnpe0hegpqkp32e4d9f/xujadoxikodanurerivu.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b287f8222e2---6070133038.pdf
    • http://promador.pl/userfiles/file/61234480006.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/922e589b21ae4af77063a9e3910167b5/rukipisu.pdf
    • http://kashima.cc/userfiles/file/lobewatam.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01741ab7d---mevogulisijavetinilij.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b79084637---miparidek.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085608383304---xozojop.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acfbc8528a4---99877148101.pdf
    • https://wineart.online/userfiles/file/82390421438.pdf
    • http://micronforgacsolo.hu/UserFiles/file/5009869783.pdf
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/mexewotuzerok.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778d08361cc---jedoji.pdf
    • http://progfin.pl/userfiles/file/24884572164.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/1o6k5ettvmi6mkqelagqfdhq36/40113342811.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c429a5195---75277312971.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b54129020---sitegokimovilefuxomases.pdf
    • https://juhaszautovill.hu/userfiles/file/lasowawizuvipug.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000184ae.bin
2441f4fbc5eced921ba4c1c4d63554c8fcb28e34267b74525d58d41ad3146734
pdf-font-stream PDF embedded font (sfnt) at offset 0x184AE 18716 bytes
font_01_sfnt_off0001b68b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B68B 16792 bytes
font_02_sfnt_off0001cea2.bin
9500b58d082d6e93b3db4a06bf858a143e22b4144b08fa45560ef3f984cd08bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEA2 10508 bytes