Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08957ec009a4dab…

MALICIOUS

PDF

86.1 KB Created: 2021-09-23 11:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a053c9455c036446d3245948d947a95d SHA-1: e539d2905495e8e9de6d5acee9c4cc905675e38b SHA-256: d08957ec009a4dabb0358ed7cc6274302cac0f2363e44e2bd0a1cc882f3ef3aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point 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. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or scam attempt, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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=123movies+to+watch PDF link annotation
    • http://didula.com/img/file/83955404319.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/26522326422.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/83461550362.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/jevepolivat.pdfIn PDF document text
    • https://www.aspart.ro/ckfinder/userfiles/files/83129127415.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/xalosabulidakoz.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/79069801273.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfbd50b3f5---jujor.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/93712629813.pdfIn PDF document text
    • https://rn62ug59c-to8.com/contents/files/87709736597.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/47011175209.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d9ec35e3ed4e41e82b2385cec8514a50/37721576818.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec523ebada---divubad.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/7g3pdnj4mht4v7ake49t8oumn2/63923529321.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/jitexu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613a237ee0d3c---50547352279.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c4a36cac3---zejepaw.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/57596625674.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/malotubitotagebutanatam.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210902212334.pdfIn PDF document text
    • http://atya.eu/files/file/sovovedoxap.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/d3528982d05bae0791d55be0f7dc1a00/febom.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210908165839.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_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 10644 bytes
SHA-256: ef34f855fa6cd5e3e05e88706cda5d301367bd4d7600d984879cf29f2a580cfc
font_01_sfnt_off000102b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 18688 bytes
SHA-256: 2bc2da4ff9153a9cc5ec0370a317620cf7f79b37cb3789e6f5dbefd427ea4433
font_02_sfnt_off000132e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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