Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82fe31a8c8bc491…

MALICIOUS

PDF

87.6 KB Created: 2021-07-14 05:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9267436cb3db970dcdf7066ce847534 SHA-1: 1dcd068f94f9f3463ee72ba23e8b169f1e1c785b SHA-256: a82fe31a8c8bc4916e214122c8b280a8bd27d77cb9652cd60fcca7517aba867b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The embedded URLs suggest an attempt to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://contactfm.be/userfiles/files/74077303854.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087024d6656d---wefijunobemutebavozi.pdf
    • http://youngshiny.com/userfiles/file/1623187153.pdf
    • http://gandolfiarchitetti.com/userfiles/files/18225721239.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1609018bc9a718---41224359719.pdf
    • https://summit-christian-academy.org/scauserfiles/files/38738558811.pdf
    • http://brilspa.ro/userfiles/file///rizogavob.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/81b4a1a7355efe45248e1467b2335604/jojejo.pdf
    • http://zrdb-drogbud.pl/Upload/file/wuzisusevelupid.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/iovgrqqh9vkj4p0lbied6g2dhj/kifapo.pdf
    • https://aquarell.ro/userfiles/file/daposuxevokolu.pdf
    • http://dj-venci.com/uploads/pages/files/tarotekejem.pdf
    • http://cnex.cc/images/blog//file/57531133998.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bbed59259---guwedinawufosozowotupuwip.pdf
    • http://anapharmata.hu/ckfinder/core/connector/php/files/79024170515.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160866594818f0---xiriredawafinonokamulana.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160779c7db5a78---lubuzet.pdf
    • https://kingwrapcarspa.com/upload/files/46271019696.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/48e1a432748d1f948a6a33c94d38489a/zivusasuvikodod.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab03ca265c---logaredamexi.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/16kan37gnque2ga2aehbkaqj83/kamuvedegakujovele.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/6d21005e67de10ac64c7d824e2f50613/biwujimepa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=credit+card+generator+with+all+information
    • 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_off0000f2fe.bin
603415243d5aec0a8cff59d9232f471d2a08780075afb267adc6b58a16acdfb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 10872 bytes
font_01_sfnt_off00010bbf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 16792 bytes
font_02_sfnt_off000123d1.bin
49efe76cb02ade8c2dc027e9da8f476fb12c475c0e7e4e4e01b56ba93c380059
pdf-font-stream PDF embedded font (sfnt) at offset 0x123D1 17260 bytes