Malicious PDF — malware analysis report

Static analysis result for SHA-256 f366b380d38ec417…

MALICIOUS

PDF

83.8 KB Created: 2021-07-09 04:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd776e4173826b2c14eb93d15e5836f6 SHA-1: 72e7ee989b62c43332e83dcd8e2dc0a2e3b66112 SHA-256: f366b380d38ec417e7cc8cefe6470e4be7c9f09e0b687103bb393ec2c56cfd7d
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. The document functions as a link farm, directing users to numerous external URLs hosted on compromised CMS uploads, likely to distribute further malware or conduct phishing. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160742e03ad07d---43777414709.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/999fd332f157879e8231ad245349a8fc/biwokibabiruke.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9334aa6ec2---76782314839.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/1rsf70ov1q7ijqjh9l42lq87n3/sewusogikevenimix.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/0g7o5bcvfc2gta74cerlmjv58f/kikedan.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/j7kum3safg5clm9cq7mj8gh9h7/kajelepi.pdf
    • http://brno-skoleni.cz/ckfinder/userfiles/files/kinumof.pdf
    • http://rocb-ap.org/file_media/file_image/file/pudobepagelar.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/10b2a029a14b8caea201373b9623cd39/27762795642.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becba25ff90---napeleduwewafowon.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2056018a33---19296169188.pdf
    • http://czdashan.cn/uploadfile/file/2021050416582973499.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b867a85031c---zawotetapiv.pdf
    • http://efuegypt.org/userfiles/file/88972887817.pdf
    • https://collegemahan.ir/basefile/collegemahanir/files/91728810395.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/g4mp1i2kk2iveip7cedicao9hu/pusukeragumesadaka.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/b16efc5e9c7b0e688fdeca34325c6c4e/60400721211.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608db46bae959---mifefitirifawijogel.pdf
    • http://ukuleleceilidh.ca/clients/860383/File/mematew.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab6b777120---jaxuvopazufeposizi.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c298c0739f9---samuwixibopi.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e4fa1a7f3---59351198688.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/87omdn84gaennnag2rsctandfr/pidoxigijusanavonon.pdf
    • http://benthanhsgfarm.com/images/uploads/files/96109306518.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=plot+structure+of+great+expectations
    • 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_off0000e6d2.bin
fa01f0a2f0573e2bb3b6d40ed9de356d3ef6d6c23284a52ac5278696c959c45d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D2 16176 bytes
font_01_sfnt_off000110a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110A1 16792 bytes
font_02_sfnt_off000128b8.bin
95c64ff62dc542372ccad028c9c1bdc1d05c8cb03d0058379da7de60f5aa4b6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128B8 10860 bytes

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