Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ba1178eb4aa59d…

MALICIOUS

PDF

81.1 KB Created: 2021-07-13 22:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fe83f387a21715bd87580ceb03b2e7c SHA-1: 826f2cbf3a9a007650e5bb016f98948cd9e6b7cf SHA-256: d3ba1178eb4aa59d5d34d3e3cf280e5780b3759d29959ba4fd37de37856e06a2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and disposable hosting, likely to redirect users to malicious sites. The document body is unreadable, but the heuristics strongly suggest a malicious intent to lure users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdbcee938c---papesumojukuvekituz.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e22057483---62779360749.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a2020b944---7226318890.pdf
    • http://umrllc.com/userfiles/files/35704170170.pdf
    • https://bestcoloringpages.com/userfiles/file/soxadalevozizojotego.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db1a71ab864---zogigonozogetizin.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160da47d4732d1---17219515494.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081abe9e8588---monesufesak.pdf
    • http://doer-sh.com/Uploadfiles/files/64689730444.pdf
    • https://autopratichesas.it/file/tukasobifakugej.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608391196eafb---83245157419.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5786ddff21---xawomekotejefezulak.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/u5uae41q2gve4egkhl95i10ud1/29541812786.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/vt9qsccerjn65gun4grv8pa22i/42555213439.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/0578cafc336c6bb9d0c99348a4384ab3/bidenuxideragu.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855ca5a202d---mazepexawik.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/9v5ncsuo4tfj9oahfqtj84fc33/wovorajerafubiji.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70d0a7f107---30100467600.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c971cb9f9ce---tomapatozi.pdf
    • https://agronlogistics.com/userfiles/files/kemuwatu.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/d7babebece1c03ba80add651ec46fb11/patiloxemotil.pdf
    • http://antifftech.com/uploadfile/file///2021061119064278.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/d4tu54gnsh79ieu0gvmrr62tij/revibulumitofinirerit.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=orange+spotted+goby
    • 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_off0000da10.bin
a39b87a9e358f47fd2d058b5d5f663a94a60eb33c43624790b3c9b7be3e98481		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 17084 bytes
font_01_sfnt_off000106b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 16792 bytes
font_02_sfnt_off00011ecc.bin
6936586f46a7fe675d4279094a2407d0dac769133cc528c91f6d53bfa74a181f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECC 10708 bytes

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