Malicious PDF — malware analysis report

Static analysis result for SHA-256 332e45a96c7b25cb…

MALICIOUS

PDF

87.6 KB Created: 2021-06-28 00:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c223c6a62e1da3ce9acf4bf5882f6f98 SHA-1: ca13299ac61aa244c63f3f62b8d099b55a4a3906 SHA-256: 332e45a96c7b25cb3ab93c3a636b962d317b826a560d5a789ec41d434dcbe966
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or serves as a phishing lure. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL patterns strongly suggest a malicious intent to distribute further payloads or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=freedom+of+speech+and+expression+in+cyberspace+pdf
    • http://khanaphatgroup.com/UserFiles/file/letufeziwavoxojuvatub.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/xazebovirozewini.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc873d03f1---56537136524.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c07b632456b7f9c6208c0636a37a3a49/90525098182.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/cbf4d725860859dcc2d56b91af0738a2/wusepew.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0f2d322b7---26980937613.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/10fbcb49484ebaaf76835695342fe0d8/mojusiwadonu.pdf
    • http://cottoneauto.it/userfiles/files/57914065003.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6693c8f3cf---nuwuvut.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa59d802b8---38636442428.pdf
    • http://maduraigarlandshop.com/userfiles/file/6446878205.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68f4ac5659---55175369804.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/qtbcd30lcrh7kklm96lckp8njv/watevazukitemofilaniluzi.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cea54fedac7---vodomosekirumodepivok.pdf
    • https://nakipoglugroup.com/upload/ckfinder/files/lodosoduwuxewiwubet.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607684e00b607---poxavitaxize.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/19017e751047b5818c00830c678d8285/50448802163.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/7rhdh1ou4913q4tecav0ijj1o4/80015062860.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/hgnqcuoa445no2p0kp7k7cfj67/67006628962.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608c05b392855---1082381001.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16229768547688.pdf
    • http://bigandtallking.com/userfiles/file/nadaxitinozas.pdf
    • https://opsclown.it/ckfinder/userfiles/files/miwav.pdf
    • https://houstoncoinshow.org/FCKeditor/file/16166294010.pdf
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/18571775445.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_off0000f395.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 16792 bytes
font_01_sfnt_off00010bac.bin
3fb0f4df30d0ee373725c84b4b33d25456742a8e559a2c5204bda3952d77eb13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAC 11072 bytes
font_02_sfnt_off0001250e.bin
8314e263b6a3262b53c8a74c148f7ae9e8b830ac5c94665245a63a1618d77c16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1250E 16820 bytes

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