Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e6517f7d01bd42…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 02:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8c1fde808cf3c50f5ddba33bf17c5460 SHA-1: 9b2821d56a515b0e4d15e872ecf9522de6f96a26 SHA-256: d6e6517f7d01bd42ab6aec443dc031598861bc1b848632c1c41050c65d620ed2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious or deceptive content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on compromised CMS platforms is a common tactic for evading detection and distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/148730216e42e77584553bfdd78d6931/16809188135.pdf In PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611d8d80a775e---gofipovafa.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/8989882712.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/80483447367.pdfIn PDF document text
    • http://runhouchem.com/upload/files/920303301.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/42653439537.pdfIn PDF document text
    • https://samowar.me/upload/file/xiwitasowup.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86f469f58f---vekezutevumetenazer.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/futirarimi.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/pebisotana.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/6d892fe9d554226a4a0ce859adce98f3/7373680712.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/bbundjj6vlbd6k1fokfbm21ds3/sepijakowuvezasimu.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/uefj89b4fitb6ho7l67h40dcb4/35616498787.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c556d4af007---baxozofa.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/tro89e2oivm57dneisjopp4lr1/bukiwuvuzuku.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/e6bo81h3ddlc9tjjhlh2vrpq9g/zikaxomopozolevej.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021082504131313.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607116f72132e---50244172227.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cdd17aab0---zorapisufuzazeruv.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607027e7cc565---34401707431.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/vopow.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/55033097842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=examples+of+censorship+in+today%27s+societyPDF 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_off0000ddba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBA 11116 bytes
SHA-256: 1f9ead850d3b58c0af9b32c7432d88f183d7a066f4564a417d4acddd9399ff66
font_01_sfnt_off0000f787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF787 18516 bytes
SHA-256: 8d6a96589f456c6ddaa4a01161c1e511f6c0154afcfceeba7f6d1e9428b92f79
font_02_sfnt_off000127ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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