Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b20deadd6f467c3…

MALICIOUS

PDF

99.2 KB Created: 2021-07-02 00:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aaf3c657d69b11aa225a1db6c7c35aff SHA-1: d91d40e67c3e9d6ad0fd1d690adcc0b00a87e220 SHA-256: 1b20deadd6f467c3f9ce583372eec085513063757442dae880f5c2c8b6bde75b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a7320730209---70367260923.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/7d707b1437d6c81a81a4848e71bf0c75/teluperuvekutaxudinoxu.pdf
    • http://poiskvod.ru/images/file/11220316895.pdf
    • http://keletunderground.hu/images/uploaded_pics/file/pateke.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/rq04q7h78kv28o2n2825ml9qq8/39564104341.pdf
    • https://abugfreemind.com/userfiles/file/javolikojuzesi.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nbhku64jolbg8dr3odk6orsa47/tifixada.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac919ceaa28---dutezipuzifedizuto.pdf
    • http://tylincms.com/userfiles/files/65078087596.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef8b4cfc88---25463812976.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/q3pg666825vdg5aj2bcoi8cdat/12145227570.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835d0493b7d---88008571277.pdf
    • https://netpage.info/userfiles/file/lajekodemax.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/5c90c6d87d1fccaa3bc7aafdc183c53e/xuzora.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/d11eea5256c52cc776d0b8eb1c7fdb72/15295214457.pdf
    • http://esoftland.com/userfiles/file/6752243931.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d1aae8315---44086141627.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/0372611d9db75b10aeffc370c264530c/nupunibowakoxivilud.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a3e3cc41d08c3da2d466d9d3ea93dc4c/fikigigig.pdf
    • http://avision-italia.com/userfiles/files/61438473136.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/t9gc7sboau9ph2f71jou3vl8f5/82788031318.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/db1a24d2bccf529fd25859644a6e8d67/1451755049.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fdbb10f90---zupakefiwewale.pdf
    • http://alrabbancapital.com/file/files/zazolojaduzowarajegod.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=contaminants+that+enter+the+groundwater+may+remain+there+for+decades
    • 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_off00012000.bin
c7532cf86a8508b205f24157392aea65c4c1a4a1f6d52ab32f057e11e8ce4c73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12000 17132 bytes
font_01_sfnt_off00014cb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB4 16792 bytes
font_02_sfnt_off000164cb.bin
2384246340e0b63e5b40d52af183d00eef4930139548b9288778102caf69c97e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x164CB 11208 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.