Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be3386821ef9d5c…

MALICIOUS

PDF

101.1 KB Created: 2021-08-08 12:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0236525e3316be223bb68db54e4c7592 SHA-1: 17c306196be010ad7e28d20d040dacbcf7b06d27 SHA-256: 0be3386821ef9d5c961be8e99d24e1410ebfe15a1ab423d31ee6a8b8834eb3d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://ketchas.ru/uplcv?utm_term=o+que+%C3%A9+trombose+venosa+cerebral PDF link annotation
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095959f7a853---fujigiteri.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/30134104810.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/7l6unak7jfp16jcf7g1vgfm3b0/roxurukufigekifiw.pdfIn PDF document text
    • http://metallpress.info/files/dupoxodebugaraxidanos.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e4cf8a3d0ad---kunikifijaxuduzowe.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ec240590---92294377485.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/e91f4f3a49cbf22ed2fb11c3f7afab9b/durafigojafotawepaw.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/rutoluki.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7de0e5289b82c895e1e027cad46c2f61/samij.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/kokekipi.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/libirave.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/kabinesudopabofemabepisi.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91322a97f---27845499304.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5ed4d73b---29417537527.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/79637899101.pdfIn PDF document text
    • http://dhs1959reunion.com/clients/871764/File/fatopulomawebitipokerig.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1610d1370d03c0---bulodexapovozufawagugeke.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/lividiwagebelaf.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/4247d3d35511e6bb8243fddd3e0e0a20/sewevamejevowedu.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f977ae6e749702d3aa547783a86145b0/zixeropidatipobusosizif.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/76130932439.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/bilovifanagivuvamuxiw.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_off00011efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFD 10932 bytes
SHA-256: 59ae3e54ec2da03d6b42e0dfaa42dabc74d4646041827d62da7cb99970cdce61
font_01_sfnt_off0001381c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001502e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1502E 19656 bytes
SHA-256: 94f964d70f4aeae09cd19f15e4a18499b05add9c406c7bf4dced39096e04d8f8

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