Malicious PDF — malware analysis report

Static analysis result for SHA-256 adff0b76141391dd…

MALICIOUS

PDF

89.7 KB Created: 2021-06-26 04:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0bed6d439aa359cdf7adadd1374fdcca SHA-1: f1312555206ad2bf2204204eac9dd068ebe392e3 SHA-256: adff0b76141391dd45060eb929226b829f57a26085c4a1afa0d8988d600416d6
196 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a social engineering attack (ClickFix). It contains numerous links, many pointing to compromised CMS upload storage, suggesting an attempt to host malicious content or redirect users. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a likely intent to lure the user into executing a malicious command or downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://www.alex-vasilkov.ru/images/wisdom/file/xalopibudebegujejevosibe.pdf
    • https://luyenthitoeic.info/userfiles/file/76515784552.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070ebacb8461---96139628294.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd7017168c---56955778389.pdf
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/xulizalanonoj.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607399d9eff7b---29805326502.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/d676765b4ba86bb6faffa7c5202db4a6/74944909999.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077649b9e093---ruleguxina.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/efts64pu8uhv9g5hb462tgodr5/vofadumoferibexanoko.pdf
    • https://circolodelpistone.ch/userfiles/file/bojunoxakibotexuzadexa.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/dbtql84m9ci2s22c4589080ob4/jinalidubijinaza.pdf
    • http://laiyi-art.com/userfiles/file/8349851803.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af69b770768---99344619062.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/5016ffaa311af2c3aeb2b0c2f11893db/66847289796.pdf
    • http://boekenwinkelindex.nl/images/uploads/85912296904.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea4a809ad8---dufuboluwezajovugufa.pdf
    • https://perfecthospitals.org/FCKeditor/file/ruxeberi.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f259f0806---gigiper.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d6ee3fedb---wumagomuwigu.pdf
    • http://tremonttemplemacon.com/clients/862779/File/80775025489.pdf
    • https://getracemirates.com/userfiles/files/boteteva.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=display+driver+stopped+responding+and+has+recovered+windows+7+fix
    • 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_off0000f8f9.bin
8c11c92f4484ad39b4a9307ca3210f1c78f8e7be4ac88db0cbe522fd955fd3fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 11316 bytes
font_01_sfnt_off00011376.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 16792 bytes
font_02_sfnt_off00012b88.bin
e6312d13026413848c0b81d80cef579252737113729e69409a7963370d4856de
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B88 17296 bytes