Malicious PDF — malware analysis report

Static analysis result for SHA-256 930446922e84665b…

MALICIOUS

PDF

78.0 KB Created: 2021-09-23 23:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4dbf70dca3caeb962a1704e3cf46f7a SHA-1: 1a410c37b6ce3ee775024ebe4b4be04ab825945f SHA-256: 930446922e84665b5400b7710f3d0e3850cf8c7a657a3eb073ccc19deb8d57c3
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites and utilize disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution, by presenting a deceptive collection of links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and malware detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161402191100de---denugufu.pdf
    • https://citytrafik.nu/images/file/juxefokapelitenarutefe.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/nl51ivbb542heiv8vlfmcuqfh6/sudoxosigoduneduva.pdf
    • http://czdashan.cn/uploadfile/file/2021091109052973499.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/o2a6l45ejpbr0j6k7284e2slv4/vagufegegoboxelizufo.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/9592681304c544b71160edeac27cc145/27070326845.pdf
    • http://braciszewska-klimek.pl/fck_files/file/lemamezunozimanepos.pdf
    • https://namphuctourist.com/userfiles/file/kemofutatojozu.pdf
    • http://sumosushingrill.com/uploads/files/12479618330.pdf
    • https://podiummagazinenews.com/ckfinder/userfiles/files/bawoju.pdf
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/65547045710.pdf
    • http://www.pethouse.es/ckfinder/userfiles/files/51531725836.pdf
    • http://veitali.com/upload/files/vorijugedexaxabulumoloku.pdf
    • https://sfeerweter.nl/userfiles/files/25795719686.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/597379053f39c5a2815669d3f953d4c7/85962021803.pdf
    • https://speedwayinfo.hu/uploads/file/sijizenamusi.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/mizikumomasuze.pdf
    • https://bulendengin.com/upload/ckfinder/files/rijijebanogativix.pdf
    • http://satyavnetworks.com/fck_upload_images/file/mavogimakixoruselir.pdf
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/wajedupino.pdf
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/42769385621.pdf
    • http://hyswimpool.com/userfiles/58932244853.pdf
    • https://avukatwebsitesi.kocgrafik.net/upload/files/48795996495.pdf
    • http://ccshecea.org/upload/files/domujerosorodus.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=dragon+ball+z+shin+budokai+download+apk
    • 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_off0000cc4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4C 16792 bytes
font_01_sfnt_off0000e45e.bin
3e1776eb62ecc7adc9ea0c3d24b52b0cc9a8c2b5e272331fe6a68c9204e24e78
pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 17348 bytes
font_02_sfnt_off0001119f.bin
adf693b54238d6892d904951503f97feedf81661d5663dcfb3d77255a0c3a493
pdf-font-stream PDF embedded font (sfnt) at offset 0x1119F 10920 bytes