Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec1c525582337b1…

MALICIOUS

PDF

90.8 KB Created: 2021-10-10 10:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 91e55d8bb9d57d78891c8f0a5834c68c SHA-1: 34e95cccd98546938d637f50115668a8aecf2202 SHA-256: 2ec1c525582337b1774fcb2914762bd58ff71cd5305991fd19d0f88997f81529
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://nomylo.ru/uplcv?utm_term=watch+the+real+housewives+of+jersey PDF link annotation
    • http://maychamsocda.vn/images/userfiles/file/magixoxijevaromuf.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/674e5a9a5011b6837decb52d58a40e92/34501331341.pdfIn PDF document text
    • http://ppp220.com/Upload/file/46314604704.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/doxosariselibobipesite.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/levugadimole.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3608b8485---xelomumiwurorovewara.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/dawemepaviro.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/pewitukoxirofewemuxaki.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/71191067275.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/13077122206.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/gawivukerixutovolo.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109191150362466.pdfIn PDF document text
    • https://arendic.cl/files/13356818764.pdfIn PDF document text
    • https://iimranchi.ac.in/ckfinder/uploads/userfiles/files/muragati.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615852a8b9d9e---zegurebizazotikagevulajul.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/kosotobaxabarariva.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/18118465374.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021100709495616.pdfIn PDF document text
    • http://hy-sf.com/admin/upimg/file///dijivakujeverasifed.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/17541321705.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/kavozesumalesesixaz.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/91587037087.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/rubufi.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3cd4a05b1ddfca217b2a83be0126a718/fuwojuroxulelerivik.pdfIn PDF document text
    • http://parfumland.sk/upl/73529247070.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/42075601925.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_off0000f6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F11 20572 bytes
SHA-256: a69ab9bc781885b0104e7190da39be51862f1d6c9cdcb459c2692a71fcb0c0dd
font_02_sfnt_off00014414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14414 10816 bytes
SHA-256: 588e22691a4c009f0b390ec61b371ee70328f170f3cd9f4aadf1cd20e1e8af00

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