Malicious PDF — malware analysis report

Static analysis result for SHA-256 32ef8af91b10efe6…

MALICIOUS

PDF

92.5 KB Created: 2021-07-22 01:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5c5f07c09acd016953f68e32436d0762 SHA-1: 866550ef6abbc2fbb8f53cff56cb4a163a7aa301 SHA-256: 32ef8af91b10efe67d31d9d145409fcb5c422e7a5210019ccc6b3cb824e45926
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of PDF link farm heuristics and external URI firings points to an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/73eb2e14b1a0a9a4249e41536ddd916e/37195680590.pdf In PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607810572514e---54359133004.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086727628df3---rilopexagekonuromovok.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ii3okjirbt6qsp376udo6qdir4/6461755936.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/07ed3e35657aebd5d6d836a358496f25/7051230584.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ic11nqccb6l5vmj1oj04pben96/3758607206.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/labomapitevovazisama.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/47425454690.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca0e50f608---34373821663.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8511be3c7---jovazagavagupifa.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/tewozepe.pdfIn PDF document text
    • https://thepainter.asia/upload/files/34603107912.pdfIn PDF document text
    • http://sns.hu/_user/file/97398138010.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/73121269176.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/71051900015.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/luduzurijivigomogojapo.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f5f751444ee7ad32806202b8084822ae/nalibepuxusadojoxijim.pdfIn PDF document text
    • http://vhktn.at/images/content/files/vagegurifekanirobiwi.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/13942194259.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/806964635f07c522550e20c15a56071d/zerufez.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af711c951ae---pawaforarewisu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/941fa351f5bf065fd55a5c3bb99c07a3/21915413394.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/56604540028.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/wolipajexibaxisibobu.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/8f6d8e72c24a936d6f9dd382b088d8a3/fiwixaju.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090883aa3570---33553872665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=an+introduction+to+political+science+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C66 17592 bytes
SHA-256: 5d7252f4ca8630a462c378f20eefd52c25bdc702644714124dd4a452b6dc417c
font_02_sfnt_off00014a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A78 10692 bytes
SHA-256: 135a1cedd15784ccf5e38db37ad75bc3c7f22c99a337795f44bd9bb909fbfd3a