Malicious PDF — malware analysis report

Static analysis result for SHA-256 4735205c06340a7c…

MALICIOUS

PDF

77.0 KB Created: 2021-06-27 22:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff3f4e95a9dd53a1ea68d2c6555c6641 SHA-1: e0c2a8cb1a198de61a0a7db8403ee103e5befe67 SHA-256: 4735205c06340a7c0a1b5be183d6c326728f7da2500ed95f8f3dc3c19dedd0c0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to compromised WordPress sites, suggesting it's part of a phishing campaign. The presence of a download button lure and a callback lure further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160af7e5b2be5a---22848324104.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/7e1e95911d14f327a9a0d27748db142d/97585768136.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607943cc67720---xebubufarawipekapufisedi.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609704741cf36---xijogiboditisawudobunoku.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03e4279197---26153595331.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb0779411a---65752172767.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc63dfdf871---66649673876.pdf
    • http://bptramptour.pl/files/file/45999158266.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/0aaf3aa49898854d0bcdb97caa994c06/vetujotojorevod.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af1e212e376---55266775050.pdf
    • http://mabifitness.it/userfiles/files/86340793568.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ggco93i23q1v7ijjv5pjnbs3qa/sapesoliwezenanabuliteger.pdf
    • https://shidoremicrosys.com/media/kudibitidarole.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/b7657ff5d1d413a8b71e3e71b3173e43/jogetalaxitonuvewene.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c887182ac9---zuzofo.pdf
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/bivaki.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/p9p4ig1cueah5e77kc9482h5pu/gebobuvewolawosozezukibu.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f04aca0d4469826ccae9cffc476336e1/kazosubedugetukunaseduze.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c83cd3e6bdd8e948f4f4c1fc1a347716/femuvedizo.pdf
    • http://rund.cz/UserFiles/File/7236337212.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a522a1e7971---pinopegejawagisov.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608d995d92d10---dinumexejifejaxojagawoxog.pdf
    • https://stallion-international.com/userfiles/file/laligutufikirokokedixezuk.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607c31ec606d5---83812259287.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=design+of+machinery+5th+edition+pdf
    • 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_off0000c859.bin
f01f5cd683e1e2c73663d8687db268d87ca92c0c7fd170c8adfe53d891a290af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC859 11272 bytes
font_01_sfnt_off0000e28a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE28A 16792 bytes
font_02_sfnt_off0000fa9c.bin
30dab0ff83a3a3f109cb8bb9c5e3ea6b6f2c8a8f6914c9fa02a1d3d605acd12d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9C 17020 bytes

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