Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e99c2a4a568df92…

MALICIOUS

PDF

246.3 KB Created: 2021-07-03 14:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 23a7b8bd319916c8edc8f87127ff18d0 SHA-1: 58e6e9a9eb3e461b8b7c96c1ac2c7802c0b974c5 SHA-256: 4e99c2a4a568df922fbea52d2d41e27a1ca2c685147e9a85df44a5a5320b30eb
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised CMS upload directories, suggesting it's part of a phishing campaign or malware distribution effort. The file itself appears to be a PDF generated by wkhtmltopdf, but the embedded content is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

Heuristics 5

  • 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.
  • 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://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/ae9db9a51fd473058d740a7936637030/87779674985.pdf In PDF document text
    • http://dhf-china.com/d/files/pusovonixi.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6349135986a3566b0c15f09bc537bf89/nupirovatarisemekaz.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/21914414640.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607398213e32a---vidazisudesewa.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/e08t6k6l30nii1dmgretfnvja7/79592533732.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/80441167468254b205a3e8c30ae465f5/54080613341.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/h5pun150l9ct95p9flbu9j0757/7718229110.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/dubakawusikiberivuledidez.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/fnq5q4b3vnbqe9me0cl0ltqnst/67224514862.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/39499290889.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609410b966e32---vitojinuzuresef.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/al0f7qqesrd1rm0avmdeku8898/zaxujipi.pdfIn PDF document text
    • https://zold-kommando.hu/files/80874631548.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608562d707830---mebitiravekifabekojub.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6c1f3b51---numaruviju.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160781fb9c5b2c---kusinarerupegijowote.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-7-1/20210701200811765464.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea29ac769f---sukinanijitororedulipifot.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/4e906a009c14960331d023f6fb84458b/28659610225.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/padolobajuzeduverokok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafba247f51---fijaraxojifupi.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160af941ba604e---vurafaxodozaxoxop.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/nenotizabojewaniraxifixip.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/u25geuen268rgrf3s54o0glck5/gepubigib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=electrodynamics+griffiths+solutions+pdfPDF 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_off000363e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x363E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00037bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37BF2 19524 bytes
SHA-256: 710e9901d3b75146f9173aff127941205777e860e24ab44cd43896ef9485624e
font_02_sfnt_off0003b0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B0BA 11264 bytes
SHA-256: c43bc5a4511f8c082a8b4680e201bd7d0c24f045f983c79f82bedb6096f5b6bd

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