Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b73424be1407053…

MALICIOUS

PDF

90.3 KB Created: 2021-08-05 20:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e71d49ab610d5f0a8104f51e4f1940d4 SHA-1: 1b65ec9b24099257e22050f9834536a6a9bcb77c SHA-256: 8b73424be1407053ae6bb3d56acc440c1785bb80a0ff704ebcb282ba0f0135c7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites and disposable hosting, likely intended to trick users into downloading malicious files under the guise of game downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary attack pattern being the distribution of malware via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://archism.ru/uplcv?utm_term=free+fire+game+download+for+pc+windows+10+apk
    • http://ahlhy.com/uploads/file/311145288905.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/79935856c52a375fcb3893959d03a13f/mifagonotemibarumake.pdf
    • https://sonntag-immobilien.lu/userfiles/files/79764223450.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd35ee23299---52234045287.pdf
    • http://escqatar.com/uploads/userfiles/file/file/74058578809.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c246c2eb67f---gilapo.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f01facdbae4---tewugagatuviwepikesi.pdf
    • http://arohitourandtravels.com/userfiles/file/digimojijodomaraboritidu.pdf
    • https://digireg.com/upload/xezema.pdf
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/detupax.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fee323cd1---20235030682.pdf
    • http://kino-cosmic.ru/sadm_files/96201993596.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c515356a5---9808957608.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/zotolariwe.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d2560e3e5e8e0db264c6d94aadb65e0/dulevaseloroxofokip.pdf
    • http://zae.me/datafiles/file/61406161254.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5c28bece0a159daacbcd473f1040581d/mebikujagoxe.pdf
    • https://houstoncoinshow.org/FCKeditor/file/saguxikebinumoz.pdf
    • http://terezmisszio.eu/files/file/fumozuxe.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609aca06e3b95---gatesokeropigi.pdf
    • http://aftckwt.com/uploads/file/favusa.pdf
    • http://wabasnb.com/files/fckeditor/file/31785998860add459b6f7f.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/18738047876098d88a0fceb.pdf
    • http://aapltd.net/userfiles/file/fipapafameluvewi.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_off0000fad0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 16792 bytes
font_01_sfnt_off000112e2.bin
99c68f769310d50ab208f6a58e6afcf6557117a4bb92ca2fa0dd75791ee2ed65
pdf-font-stream PDF embedded font (sfnt) at offset 0x112E2 17416 bytes
font_02_sfnt_off0001408a.bin
f8b79e1201853d0dca92c4d92055f4a588a963aefc94896ba75d83e3694ae79c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1408A 11192 bytes