Malicious PDF — malware analysis report

Static analysis result for SHA-256 254a37e1a193ab6b…

MALICIOUS

PDF

90.8 KB Created: 2021-08-03 17:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45f617ae4edad28718f614e4c084fb06 SHA-1: b079970b1de335de7ffda27a3ec6f0a775534d7f SHA-256: 254a37e1a193ab6b282172c7c494653541e9d174ace8cc61a7a873b77c12500b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://infrive.ru/uplcv?utm_term=will+miraculous+be+on+disney+plus
    • http://grupophi.es/uploads/files/31834087014.pdf
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/ziwirufuminumalanisav.pdf
    • https://silky.ae/images/bulk_images/files/91955536973.pdf
    • http://kudusde.org/resimler/files/kikizevunidev.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160934b79b3b4d---84878040411.pdf
    • http://autowassenindex.nl/images/uploads/35987763882.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/riratifasekogaj.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c18d9017c---47834894653.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/wovaj.pdf
    • http://melinterior.ru/userfiles/files/mogadunosobogirazifubo.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e5308bb01---81640171072.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/dunaoest99f1ekjuvcpaf6dtt2/vevotoxopar.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d2b0a14d0---32697049584.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f0befad1a83---82612695690.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/02fda8dff2a3234092b36907c8ca3ca3/jisiribi.pdf
    • http://iwishop.hu/file/99540678417.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160947aaee7e93---1113035227.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dab92c0d44---luzifuwemezenolun.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160833e4290173---6759707873.pdf
    • http://inventory-acepipe.com/images/uploads/files/2241653424.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/tqk0cd1igh3cg80djsur3eodb3/zilufajupaluzavawiziko.pdf
    • https://synersys.fr/contenu/file/90238010148.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9306a4c5fd---zuvikavesitixibatogupe.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cfc05695b---10291085783.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de9f38291da---48527005197.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073050b5363b---70380914148.pdf
    • http://ahkjt.com/upfile/file/biwolefogugufepo.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_off0000fc52.bin
ceb44df9d0031eff31f689a3ecaad8f4b9dd83e93a44be34efe6a9fe90ba36a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 18028 bytes
font_01_sfnt_off00012af2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF2 16792 bytes
font_02_sfnt_off00014309.bin
69d7d980567d949d7325bb8174ed322353ba1a115409e08d6fa89212016658a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x14309 10924 bytes