Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d10f3b880931945…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 00:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d57005a7fdef37987db9185418231ef SHA-1: 0731613e3bcbef746eb9c0658a6b6064d2639a26 SHA-256: 0d10f3b8809319453850666c9a2ddcd791aec7dd45da303198753ba65b525378
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure for phishing or malware delivery.

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://allytemp.ru/uplcv?utm_term=words+with+oh+sound PDF link annotation
    • https://www.prshots.com/ckfinder/userfiles/files/pibebinijesarezeponikasu.pdfIn PDF document text
    • http://leguido.net/files/jodusuw.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/damonisaxapenaxem.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/bbec018c69ad2cab4d938b93aae4c522/wujegujonopasotinawewonu.pdfIn PDF document text
    • https://fptica.ru/images/file/19798787435.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/97723158172.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/56615747394.pdfIn PDF document text
    • http://state-lithium.com/upload/files/8429143604.pdfIn PDF document text
    • http://hydrem.ru/images/file/folefopijagireromafufe.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/80923761315.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dff8324f98---28794412801.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/12549146697.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/pefomefatovitekekaguvoris.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/41923547440.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/658926abfabd9248757a803717a06679/ladirusade.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/fililarezajavuzaxapi.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/59699020713.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/vetowoxupuwaxefupuwa.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/wafigimokazimej.pdfIn PDF document text
    • https://longhoang.vn/upload/files/zotome.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/fukupok.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/3943845950.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa89b6a5e3---kuwekawuf.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/57533035011.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_off0000dc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC47 19096 bytes
SHA-256: b210c54e35ba91158645f9938214a37edbf1216023be6364e552e810d5fa834f
font_01_sfnt_off00010ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEB 10184 bytes
SHA-256: b189fb7ad7d93db0769905b58bd7e92ba9338f0c9f67a48b53464d8e7cfe8004
font_02_sfnt_off000123b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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