Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b03ae0ecef17708…

MALICIOUS

PDF

85.4 KB Created: 2021-07-20 23:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc83ea31a187d0e1c375967a21b7e3ad SHA-1: f07b165227524dd72af16280f36a6e35ed7a401c SHA-256: 9b03ae0ecef17708752199bc5612999b3a1e42a5651fecd63341ff2d437d123f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination. The embedded JavaScript likely facilitates the redirection or payload delivery, contributing to the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/8370c38a1f1e8311950d69a59ea62d5b/96870422270.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb2caa426d---jugolefex.pdf
    • http://aihyang.com/userfiles/file/46725953145.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/4568b9b749afe6bf8bbea90e2e097fb1/fijuzarar.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078e73290c37---zuluzabaretugipipevuref.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/16db03161c753a0ed4e91f6dbb586e02/gezopemeviwi.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/c8780b46bc4ef2c8bd87fd0a2520d5bb/muruzowuninejojuzujuv.pdf
    • http://alfonsoguiggiarchitetto.it/userfiles/files/39805552158.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16089af882863a---69966469482.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160878747eb343---nimizemusebokezonaxarufu.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160942863bb54e---siwiteselojefulofosis.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e18e336ef1c---24197122301.pdf
    • http://muzycznescyzoryki.pl/userfiles/file/fupisaki.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608863cecc095---57828738539.pdf
    • http://ckpak.com/fckeditor/userfiles/file/71785065530.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb667742383---49021767684.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/9nectnunf87cd6rmokl3jg57t2/98671697912.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d87baa2852---47553128103.pdf
    • http://hourinkan.net/js/upload/files/13943652255.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b72e6e568---lokamusosusibupekad.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/80638333166.pdf
    • http://mamolenasnc.it/userfiles/files/zivovowasuzomodumarizolax.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=coalition+of+independents
    • 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_off0000ed10.bin
63653bd492670ab762ed9d561e5e354243920b5b38e456ddba1249deac8bb0f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 10424 bytes
font_01_sfnt_off000104ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104CE 16792 bytes
font_02_sfnt_off00011ce0.bin
605c27ffca5c80bbefd8e7b68e5fbf4cbc29fdf86d3c9c54139ca5004f15cbe9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE0 17084 bytes