Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a66c18a8711953c…

MALICIOUS

PDF

94.7 KB Created: 2021-09-01 10:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e65ec3ebf46880f0880f4338b46edacf SHA-1: 49e68fa0e6f03942275ce6ec7a5d5ab5594aa75b SHA-256: 7a66c18a8711953c96a22ea5f9a44b78781e6ef217d6f9e8f002a8c276015635
276 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS upload storage, likely to host and distribute further malicious content. The embedded artifact, a secondary PDF, also triggered critical detections, suggesting a multi-stage attack. The primary attack pattern observed is the use of a malicious document as an attachment in a phishing campaign, leading to exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/3067269e177455a16b1266f91326832d/nibepovepidibibuwave.pdf
    • http://gardenofsound.com/userfiles/files/63395556980.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/gh5dshbb25gsqt4c2g8jbb7vvc/83434774107.pdf
    • https://gulf-rope.com/images/bulk_images/files/36316716183.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098582ae15f4---54424462110.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160778de570feb---gejojusiwavogufotegaj.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860dc9605f5---83768698705.pdf
    • http://upoart.com/ckfinder/userfiles/files/tunojolujuve.pdf
    • http://grandinhr.eu/images/user/file/34893687619.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/j3dfuqbd5raks47s18dfqj2mr9/42752157758.pdf
    • http://architettotamborra.eu/userfiles/files/62510336790.pdf
    • http://homeshopeez.com/uploaded_files/userfiles/files/gamidekafuxiji.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/c6j7g0tgpshlop2f5abo8c6bi6/giposezataverifewilukilev.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/l6judompgafa3dsi0jrhlqrh71/videsaparakevotudinakal.pdf
    • http://cybernet.asia/UserFiles/File/seniz.pdf
    • https://behbehaniprojects.com/uploads/files/katarujizuva.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ss4c5u1mk2i05hr83c5m6uc2ab/loselavaxi.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/norilebarofapebuwawem.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743a373cc77---wulaxifekiruri.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075a14c8e255---linarurijedowatogab.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cd4c0cfcb---81943806557.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=christ+and+the+church
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011661.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11661 16792 bytes
font_01_sfnt_off00012e73.bin
55703d4091cd2d27f940e06a9b9d0cddb0b0e38f4b67a839100e436832630726		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E73 15296 bytes
font_02_sfnt_off00015501.bin
9604be4c4d51c23aacce292c1059fc710701226075436258d1d29cdee7dc075c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15501 10432 bytes
polyglot_child_pdf_off000031ea.pdf
cd26f600444c8b5fd929c6d942ab73d19d5450b2d60f42d6077cfc55e48e65f8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x31EA 84156 bytes
Detection
ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Obfuscation or payload: unlikely
polyglot_child_pdf_off00005884.pdf
275f70e11815ec5bdb7cd064ff862e1c3934520b819d17e981cd09ccc7a6a323		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x5884 74274 bytes
Detection
ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Obfuscation or payload: unlikely

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