Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2bd3a2c758cf87…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 02:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b95a8f9150246cc55e6442925184e13a SHA-1: 8b3f64983b2ab4ba0bf07188d99f0dfdc223f811 SHA-256: ab2bd3a2c758cf871a6bed86920fe38b2d8426731f39d4c4d5885a61b14045b6
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple domains, including compromised WordPress sites and potentially disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics points to a tactic of overwhelming the user with links to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.farmaciavictoriayjmleon.com/userfiles/files/gopibovufozi.pdf In PDF document text
    • http://prime42.ru/userfiles/files/42935674029.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/fudilaketevewesojewefukor.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/14737303891.pdfIn PDF document text
    • http://attilacenter.org/userfiles/file/xusexosunoliz.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/ledijogajirojeliwofixa.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/89398102883.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/d2b9d5256a5e5940570a5321a22b307b/25342595332.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/41369755523.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366952216e8---dopadikegananaroj.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090607150570554.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/punifupivimokoginuxafex.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/xigudofomapekafapopegirur.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/vosanikimulemuzotoduragof.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/tubupekuledut.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/42321664956.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/87293857498.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/cee6943dfe786fbdd56e8dfceeaaa0a0/98891045156.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/94375488021.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/47355257937.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/1601fc580b0e0c7f1ef37f815ef81da8/14381499987.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/sofameterimubigavuvifuza.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/24191562171.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/tujigu.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/77651731073.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/48968542387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+vault+dweller%27s+official+cookbook+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A7 11096 bytes
SHA-256: e8fe57b15a643ae994aad6f816cdab758d9cf9e77877ff856e7d2b02c8af2304
font_01_sfnt_off0000f090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 17892 bytes
SHA-256: 8a28daf0779b60c848e51af55f96debcd71667a276df8b32456ccc5fee4985b6