Malicious PDF — malware analysis report

Static analysis result for SHA-256 451f997f1a267370…

MALICIOUS

PDF

84.0 KB Created: 2021-06-29 00:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e4d83632c42884492e6a3faa0783ee8 SHA-1: a3154a89afc22de8d0d1c1e7e5197a23901e5ca2 SHA-256: 451f997f1a267370acbafa8c33ee487c1bc26b14fa8f9bb0c6bc383a7eb46ec2
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing or malware-hosting sites. No scripts were extracted, but the structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=rigging+and+lifting
    • http://acmemask.com/upfiles/editor/files/ruteko.pdf
    • http://kirakuramenandsushi.com/uploads/files/34713288609.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/ec30c4e2144f8d0db0cd0a2a7fd25c41/83262687626.pdf
    • http://alexlunacoach.com/img/editor/file/48278997420.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jipu0kti3phiknslggp8g66c8d/72702165591.pdf
    • http://turinhotelcompany.com/userfiles/files/kuzudutumarutilelixupov.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e0ddd5cb---visowawigosozaliluxozufiz.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/1iaqbtmn2eglvf0euf1dmuahet/nerorodugobujepatud.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb5c0a0bd5---8397713636.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/d60cuvv7jopm3tam2sqihujle8/38255905944.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d6e10475f8913a34647f31f06b463b54/55353571892.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/8332066613.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074513323299---23751648779.pdf
    • https://jeneifogaszat.hu/cikkdata/files/lipawetekejawek.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fefbc97ba---997295162.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607249661773b---22883366495.pdf
    • https://123natura.com/stockages/files/xogogakaxikinewizene.pdf
    • http://gdlianyu.com/uploadfiles/file/begovozawukewabenobe.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9b381c42f---barabogarefiwo.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/5a583026974a7f70c49a3d92aeaac227/petetosumuvarodolomit.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/tndtkd7om8jt0j7iso90jg50v2/40043071525.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1e99d6f24---22885591243.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/49ada87f0cd4840ebc95b1fbb66d3026/pajowotib.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_off0000e76e.bin
be63184520bcb9158e5c0ee56aca7f5bcfe1ffe7faebd2ae7302952d0877ca04
pdf-font-stream PDF embedded font (sfnt) at offset 0xE76E 10052 bytes
font_01_sfnt_off0000fd9e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9E 16792 bytes
font_02_sfnt_off000115b0.bin
70eb5a5ad706402c8d449112539eb32c4184135c89ae080f154078d08a4ca617
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B0 17400 bytes