Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e4442fee8e3fc9b…

MALICIOUS

PDF

75.4 KB Created: 2021-09-01 02:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f5c437fef1262615ef58cb75dd5ef3d SHA-1: 36de0519c39e34f40e7c4bb7b54d5689ed5ee15f SHA-256: 0e4442fee8e3fc9bf9f4d73e96909d50ea1dddf917905af049951e829217b93c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://weddingceremoniesbybev.com/clients/72651/File/57259665994.pdf In PDF document text
    • http://barbusci.it/maisUserFile/file/31739756713.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/xafuvitotixorik.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/10379123772.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/88030347740.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/fce93b57cf736667ecf097fc10ab281f/10765626404.pdfIn PDF document text
    • https://kham.vn/userfiles/file/86059266084.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/19560696822.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c66c8c349c7---49228748733.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc25f88177---29981740697.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/71161455521.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/ginorukuvufitunosikabuda.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/39896504285.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160ab26d242a14---87701103304.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/zowezowewusugefitames.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/80697278493.pdfIn PDF document text
    • https://zzhqhi.com/d/files/42230691129.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f80c01df9d4183b7b09c01afd84439a7/46035564856.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/kuvubuxowevurav.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d01eacab96---35776686116.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/7538603180.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d83de56ac---62642846844.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/84744478046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+new+school+chemistry+textbookPDF link annotation
    • 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_off0000c137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC137 17164 bytes
SHA-256: 5122c3b0d38a4dd5934aa46c5b4d9c21729a255774b434c3cb5adbd7b1caace2
font_01_sfnt_off0000edb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 11168 bytes
SHA-256: abc8d71fc1032b832ca87fcce232db28531ba3185db5ac6e496bb54165bee905

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