Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20758a0ff1e6ee0…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 00:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf1187a96ae32261a9493bf3c665af51 SHA-1: b7f74a9ca673013d6a8b0eb6a7e4926f2aed4678 SHA-256: f20758a0ff1e6ee04c9bb4bfc895ab98d27aac003df9a597580e6a6372308925
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of 'utm_term' parameters suggests SEO poisoning or phishing tactics to drive traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=gta+vice+city+for+pc+windows+7+32+bit+free+download PDF link annotation
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/11c374d305a50fea2f790e708346fdc3/47464924175.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/larafitugexu.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/derozigatoderetena.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/xunoxuxefedurowopas.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/30350518497.pdfIn PDF document text
    • http://zgic.ru/!upload/files/38995229377.pdfIn PDF document text
    • https://ever-progress.com/upload/files/jetiwarebo.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/lixigepurajovixavo.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210916/file/16317796506405.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/i50cqd56dv89gq401u2ivqq2t0/2645392138.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/wunulekefovodalufo.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/9904863039.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/lopoxa.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/jusibugajobupusosezati.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/98224803952.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/8189738313.pdfIn PDF document text
    • https://arendic.cl/files/tunaxozigazaligobupe.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/jewukitaduf.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/sivofibagaboxabe.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300a77c22a4---7603340120.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/c66c9bc43682a5b275bf6a99ea7563ad/vudozok.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/rufodefetijetapebe.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219122359443710.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/aecbe605a645f313c054cc85b943f2d4/73143162055.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/55752611149.pdfIn PDF document text
    • 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_off0000b0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BA 14884 bytes
SHA-256: b4f5dd17633c61e10c3cc3d83fd20470723a761383908fa03d4b8f90de773ae4
font_02_sfnt_off0000ee43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE43 11400 bytes
SHA-256: 55e76f1ca2ed4cf60ed88cf388ad039d66560d67905416c71214d83904289508