Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ff800cf8911ffe…

MALICIOUS

PDF

90.9 KB Created: 2021-09-19 05:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e1366faeef8efb70e1b42c8205c691cd SHA-1: d2271c4a1d4a6ef847f2dac35b8fbe6c5634d63e SHA-256: c0ff800cf8911ffec7580c96d8935068e66410f8123424925a74e86285d78942
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate 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 delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://oniceh.ru/uplcv?utm_term=theme+ideas+for+poems PDF link annotation
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d62d918da---5778169997.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/66285351387.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/zunojovisokemazad.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/28425582345.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210905_085414.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/86747224301.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8cd238a17---69691576511.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613acb079e3bc---kexewotalus.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/45cdd9e9d69ff6e903cc4507680cbb7f/57356572067.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/28908053314.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/6179328949.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/10082222082.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/25f83c0113bd9d1d8f64c4da3c70db37/fizebuse.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/92838132766.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/fususebig.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/noxanuw.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/60566854122.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/taxetosoli.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/25612901739.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/xidugofokanafafun.pdfIn PDF document text
    • http://health-bridge.in/upload/file/tagagezosoxolapurenuxomu.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/30786195637.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/13343729167.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/7cb114d5eac9235351896338aaea9867/kafukosajefoluxawijuw.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/pateguzibepiwobizaza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bed4bba17---sotubifuparigaboren.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_off000101ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BF 17424 bytes
SHA-256: 21fbc2364f5142a07433ca9a51198e998c48b266337d8841ce1c7fe956a53980
font_02_sfnt_off0001468c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1468C 10480 bytes
SHA-256: 705735d3853a4fb06daacff79f2e796406c6330660e05013b529a36b4c1ee5eb

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