Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5635659e55e333…

MALICIOUS

PDF

95.3 KB Created: 2021-06-29 16:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08a00736ae81fad9a23275d161aeec49 SHA-1: fe1ad0e8d3a46b0b5351ca136d094f3f031e33d0 SHA-256: ef5635659e55e333d35a0b87706db7e3b673e16c6c024f16233e0047db4a4af8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://pistant.ru/uplcv?utm_term=auto+clicker+iphone+download
    • http://alacarte-design.de/userfiles/file/xalivojisop.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6a6d30801---rodafuramaluxefofoti.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160745770ecf24---54786354099.pdf
    • http://kondicionery-fryazino.ru/upload_picture/file/58889377658.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/1596cdc4bd667562e219afc48a36cd71/13114131697.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/1648a811220f32c262fbeed9adbc9a37/38662147975.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada0ae09dc4---5898582533.pdf
    • http://hy-concrete.ru/d/files/25138309364.pdf
    • http://sungsam.net/userData/board/file/kikom.pdf
    • http://acecaalcoy.com/userfiles/file/16437745802.pdf
    • https://fwullong.com/upfiles/editor/files/piwitupade.pdf
    • http://airsoft1.ro/files/file/48757032518.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608e59bc272e2---wedeluwuf.pdf
    • http://personnelstrategies.net/userfiles/file/37017340308.pdf
    • http://vidol.nl/userfiles/file/kefixigizizokawedovawusu.pdf
    • http://filatelianumismaticaumbra.it/userfiles/file/34023738059.pdf
    • https://alexandrapanayotou.com/web/images/static/file/73204031366.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/79059a1eb4a08e92328efb6341562606/94149636254.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/45irvnskau9q8g09jebm3ck2sm/lokafiga.pdf
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/vutesotivipifuka.pdf
    • http://cheapmarkt.com/userfiles/file/12172097747.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/88e6tm11ttr6knjfigjgv2p2s6/80088417932.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c367134fe9---3994093927.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/29rdbul2v8lvdo0kdghrv5oce4/minameselib.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/6ef6b05edfbc168d696ceab932d68671/30826124360.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b82f180232---wapinit.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_off00010fc6.bin
fd39d4a5e1a9e6f633a5b2f7131e142f90793d976d540ca107e9b2edf337f925
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC6 10704 bytes
font_01_sfnt_off00012855.bin
7dba31bb5d13823c401ca64b681afbaaf574448f79d5a41eaa4a87f226e338bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12855 17976 bytes
font_02_sfnt_off00015790.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15790 16792 bytes