Malicious PDF — malware analysis report

Static analysis result for SHA-256 714d8e9b4ec8d3f2…

MALICIOUS

PDF

70.7 KB Created: 2021-09-30 14:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a926aeb16f634935809467fbeadbb27e SHA-1: a8e39989e55569df0011c4288c1b9982659d6fe4 SHA-256: 714d8e9b4ec8d3f2a99f45a3151a4b1d6471a3fdda1b8c5086763fc8aadce799
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=adobe+photoshop+torrent+for+windows+10', suggest a lure for potentially unwanted software or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=adobe+photoshop+torrent+for+windows+10
    • https://tgvl.in/uploads/fck/files/45303055823.pdf
    • https://rireenfrance.com/images/upload/files/ribuvu.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1614e17d01acf6---76666624271.pdf
    • http://tehpromyar.ru/media/file/sugazos.pdf
    • http://chirineli.com/img/lib/file/misoruwanifewisazegop.pdf
    • https://knoxvilleremembers.com/media/denapavenesegip.pdf
    • https://sangogiaphuc.com/admin/webroot/upload/image/files/94387142888.pdf
    • https://okinawa4d.com/contents/files/95089307258.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/qooq515imkcgofirn0caf1qa7c/22409501975.pdf
    • http://world-housing.jp/ckfinder/userfiles/files/naxezidegap.pdf
    • https://reniuved.it/file/vikadamurarekafirebija.pdf
    • https://muahohangnhat.com/app/webroot/uploads/files/33275634673.pdf
    • http://sinners-party.de/media/file/86097073736.pdf
    • http://www.perlodrink.com/documents/12236984436.pdf
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/32949626869.pdf
    • http://pho32shabu.com/uploads/files/71200284596.pdf
    • http://szjg.hu/images/file/10047557642.pdf
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/pisajisekifasoz.pdf
    • http://pwmtqatar.net/userfiles/file/zukuxateku.pdf
    • http://guerrazzi.info/userfiles/files/baretimu.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab67072e48---77995084955.pdf
    • http://aaykpn.com/uploads/editor/files/zulunop.pdf
    • http://zussobrance.sk/grafika/dokumenty/56955330610.pdf
    • http://hyunbulsa.org/~ewedd2/userfiles/file/samorobonapipom.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_off0000b269.bin
da9d31f607910c1792a2dcada71372e595ba2c31c81432d16a99e6b6ee6f5dfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB269 10768 bytes
font_01_sfnt_off0000cafe.bin
b42fc14ed51c0e812fb254a933b8f0cd84a0582dce542ba3510b734c79a5ea94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFE 15772 bytes
font_02_sfnt_off0000f302.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF302 16792 bytes

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