Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a51e5c2d57da65…

MALICIOUS

PDF

145.3 KB Created: 2021-07-22 02:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 324458c22c6b3aaf7eaac797200333f2 SHA-1: 0ef23d3c7eefe6de5e5423b0538c48f10db71738 SHA-256: 40a51e5c2d57da6506bec7d1d10ed2b567f465736e7a16fcfa472231e92c5af0
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with several links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is unreadable, but the heuristics and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://wsp.pl/userfiles/file/bavasagixufevajedawurokuv.pdf In PDF document text
    • https://ev-owners.jp/userfiles//files/28605963554.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/92096478887.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608594b14e14c---18600270107.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7d85e8d1e---83068836665.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/kexawafogaguduxiret.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/55593422221.pdfIn PDF document text
    • https://ka-base.no/images_content/file/dotufifo.pdfIn PDF document text
    • https://sapporopools.com/contents//files/22126796058.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/jururakikelaxamufe.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f146f128476---satuk.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/jasaluw.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/9um8mf1guecd59plu594b8frbp/fepofodefagideziki.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/badufuzulidinenakozude.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/vibepozifuk.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/69013906016e51c246b54892c5743692/39917580002.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/da4fc4b6153862a4db7d35e39017f0b6/43325061052.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3d533bad6226815655ebd604c8f80659/65657630748.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/afe4e060fc0f062902bb10e14ec27e5b/bawesewuko.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/21585939876.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c596f48a695---843454778.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ac3026d4c---62728269339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=toccata+and+fugue+in+d+minor+notesPDF 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_off0001d55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D55A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ed6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED6C 19356 bytes
SHA-256: 821574d120f2b1773b0d2651fe94ed8e524f92a629b7b2f2b55cc957741b6393
font_02_sfnt_off00021f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21F36 10836 bytes
SHA-256: 04a12fc41d89ac472ded1088147be0410c031e8d83d59dfc02fd7057d8556977

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