Malicious PDF — malware analysis report

Static analysis result for SHA-256 01da542bb411bbab…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 00:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5b3ee7f442421ecc764d9f7cf2ad812c SHA-1: 18cf2342eb802b4b6521489cfa07a3d63aa55e61 SHA-256: 01da542bb411bbabbc8da8528bc1cfe3838fd94b5060bf01d0181e243495e0e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting, suggesting an attempt to obscure the final destination. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=english+grammar+in+use+answer+key PDF link annotation
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133ba6ea08c1---27259129513.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/xinogeruvurefaror.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/jurunerizowulibalobisimi.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/wakiwezetowere.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/20358267574.pdfIn PDF document text
    • http://leguido.net/files/jodusuw.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/16571122893.pdfIn PDF document text
    • http://surausa.com/uploads/files/ledumamiretadinupif.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/20429267825.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8f62a442a---duvapudej.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/73229400506.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/jubutesugeluzonejefir.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/37384428368.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/sudasazukeponedu.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/nigogos.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/3914935059.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/xureragupikumevi.pdfIn PDF document text
    • http://dgjst.com/upfile/file/fenupuviraliv.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/kujafiwibagiw.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/rupikonewikivenumezeterux.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/nuloviwudurevepigokam.pdfIn PDF document text
    • http://surestegc.org/documentos/file/21040421273.pdfIn PDF document text
    • http://d-innovation.com/upload/files/3496931296.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/95e6228f721c11f7664805b5ea7f20f3/rojuvizimetojuleg.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/63913172866.pdfIn PDF document text
    • 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_off0000d8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E8 10712 bytes
SHA-256: 692b01a3c1ade71f1abe0f483026af39d6c830424614b79f664782ebec301e0b
font_01_sfnt_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 22468 bytes
SHA-256: b85c0343682e2797d119403092707bfdbf1713b28c1ad8ba06628edd347023ea
font_02_sfnt_off00012a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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