Malicious PDF — malware analysis report

Static analysis result for SHA-256 810d42a2c846cfaf…

MALICIOUS

PDF

88.2 KB Created: 2021-08-30 12:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e5c7287f2a2d7d68fe50c04b12de33cb SHA-1: e9e78c4e837dc7aaa145d2a49186d72be709ecb6 SHA-256: 810d42a2c846cfaf57678626d40c59e5030428b122f261bf6704db84d0e33ed9
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://csn-alliance.com/data/files/zinuvotikozite.pdf In PDF document text
    • http://mg001.cn/upload_fck/file/2021-7-23/20210723050554158197.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b11b3d00d47---gupenonolanazerewi.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/tazaxo.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/pobaliboxewu.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/88459702684.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/36042884978.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/zudagasuzogilevunajije.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/segelabotiwakabufamamap.pdfIn PDF document text
    • https://akemi.ro/hirek/file/sumoruxiperodomikurufiv.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d19f47874d48525e4c862e0314e59a40/pesurebevof.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/6115142805.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/62009258622.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/58538563720.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/2011443239.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/wajelamuxemimekoniroguwa.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/pozakaxukuxenop.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/gudufo.pdfIn PDF document text
    • http://rivucota.com/upload/files/midalotozo.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/61683880995.pdfIn PDF document text
    • http://nature-revive.org/files/file/panafafobazuvu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/luguwozosovesi.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/97582104225.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd61f51ed1---kudubuxotewurebasupajev.pdfIn PDF document text
    • https://artbynela.com/uploads/file/19558035630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=wow+arms+warrior+bisPDF 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_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA7 18632 bytes
SHA-256: 6e988cfbdece15b1f2ef79d73a88689ee3227dd1fbe2bdaf3052c4fac4fab150
font_02_sfnt_off00013c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C29 10108 bytes
SHA-256: 9fc91b0502f527c884819b2c19f2de7b5604e3af5d0a9bc0a46a3adf3acdc713