Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2cb3727cf4f6d54…

MALICIOUS

PDF

84.1 KB Created: 2021-09-05 02:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b74170427a977fa1f093c5a26fc16ed0 SHA-1: b772ecd4240f170dffb123d5a26b00be3a60bad0 SHA-256: c2cb3727cf4f6d54fa5b9ed9bb0e9f74f1095136e41abcbc19fccdeb4d1738c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=halide+raw+manual+camera+free+download PDF link annotation
    • http://bioterapiazabiegi.pl/obrazy/file/naboli.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/bofasurukakuve.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/41879150038.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/lusiwerogomavitovop.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613156b60b1fa---90231492784.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/sitanuzasojuwomutagu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a605ed92e97---60524575020.pdfIn PDF document text
    • https://htchninc.com/d/files/tenapujuxesubiso.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/40189875338.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/nasabogixo.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/03rbtpar9d2l0quvaad3b23d36/73560095992.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132c524d07d4---2931042343.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/tewobulixapuwu.pdfIn PDF document text
    • https://polaria.cz/images/file/folevivowomodisis.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/cutdq469jghcm3lp75t9160rq2/99841837681.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/jamaxurijitafa.pdfIn PDF document text
    • http://normel.org/files/upload/file/64906427278.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/mazemuvizekovuvorilen.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/6343853409.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/do62d201hkpp64mak4ig7hgf7i/ravazikutexudewivoxanud.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/bajiribobipulevesixekube.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1df7f2c4f---jopazijiwodirad.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/75383670776.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_off0000e5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F5 10548 bytes
SHA-256: 8aa3c4efa8d5bd33e6c2da3c30309cf730048fee8a9c84d3b9a3450401c235f2
font_01_sfnt_off0000fde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 17304 bytes
SHA-256: 8ead3e214564c82e3da4b5da23da0188e2b4fa964139db3f16f43f1b4349b967
font_02_sfnt_off00012ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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