Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31a32997e4b895c…

MALICIOUS

PDF

89.1 KB Created: 2021-07-01 16:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1b2c88991cd7bcb93d463cdfecb3220 SHA-1: 3be30d3d081a4fcc7536fd0a380dfad419415158 SHA-256: f31a32997e4b895c208c30898fe4820816194bb30cbdac325ed8f64ec58c9800
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS upload storage, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself is indicative of malicious intent, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c755b25fd37---rawuge.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/cea9f7a068ae62733ef64db8c25d2128/rozomol.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/k08sje18of4j0s4i4tf6j6771q/22375230325.pdf
    • http://eurekaelearning.com/upload/news/file/54319858689.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/9ufduta3du8l8cf93fpe93sq0c/8775999652.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160778095be54b---kagipas.pdf
    • https://learningsolution.ca/userfiles/files/vumoludovosagulerixer.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eae40ec88a---77900244747.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a72f94bf20f689dbf3befa17a459a50d/satujupujenedujomivivivid.pdf
    • http://adabaskimerkezi.com/upload/file/33828172928.pdf
    • https://creteservices.com/FCKeditor/userimages/file/32639769020.pdf
    • http://zzweien.com/d/files/rifororikom.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/q8rco2mp8mf04e39a9quqeno1f/kazometibipalu.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bd54d490b---24711678891.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee7fb10c61---64740467163.pdf
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/48022367825.pdf
    • http://oreade-breche.fr/userfiles/file/72935162609.pdf
    • http://ankurgroups.com/userfiles/file/zonusevaku.pdf
    • http://nitexprofi.cz/userfiles/file/37360775506.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/r9ag4f22b8vncb7orognumva1i/lezixanuboxu.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/bc6c10188ae064bd24a4e6e7b90f6526/tawabumeribuluxewosejew.pdf
    • http://cosmic-kino.ru/sadm_files/ziwabikuvetekimo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=early+signs+of+gallstones
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0A 16792 bytes
font_01_sfnt_off0001121c.bin
505486220ae11fe9116edf6d6891e87ac4f5543e521dccff4ceff5073c78019e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1121C 17476 bytes
font_02_sfnt_off00013f9c.bin
7863de3253e67ffaf46eba11195b8cab0eeb6036ea51a2bd17411291044f374e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9C 10484 bytes