Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf1ddd8e7f19fa9…

MALICIOUS

PDF

84.9 KB Created: 2021-07-05 21:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26698faf4de5057dddf440d85205619d SHA-1: 4e5d12bc11408ff9a618639a844e6bfc0933327e SHA-256: ddf1ddd8e7f19fa924774164e697640be73ceca86c6a962c61c7f2b2de26c76d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier strongly indicated maliciousness. Although no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a malicious document, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://minerva-collection.net/files/files/69603059348.pdf
    • http://adaviestransportltd.com/userfiles/file/41753777431.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/de202a2d562a526a3311a87a5391ccb9/dexax.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/330f1894ad59fd1ce5951e8acd666b3e/82828146776.pdf
    • https://olterus.info/contents//files/nawosij.pdf
    • http://geteffective.biz/uploadfiles/file/72627505811.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/fbb3ca62424a9acfe0bdca8507f1fc32/71845091445.pdf
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608006d3bb2a3---10181179079.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/03d8165ce62e920c61be0bab1df06725/62932487494.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1183a8c3c---belejeborilitibewuxenik.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f82277e87708bba811088efac1338ec9/daragobexiv.pdf
    • https://bloomland.com/sites/bloomland.com/files/47656314108.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080b444b68cf---xaxisigov.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/bgjc9rr7he7dsfgg6kvgj4c5tl/taxofewogumaxevagurixo.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e71d3eb56---78002953304.pdf
    • https://go2germany.ru/files/file/sigibiwofa.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/vtjksdhcm49abfjqsd6od0l1u3/mebobafonokinomeledirivi.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/4ddf5c3501d5a1592037bb91e51a1409/47196366578.pdf
    • https://playerpress.com/ckfinder/userfiles/files/52635059093.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b4de4d839---gupaw.pdf
    • http://www.truca-taoules.com//ckfinder/userfiles/files/riwazafuvad.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4714cca13---sagopijodawekowa.pdf
    • http://muzycznescyzoryki.pl/userfiles/file/53163820255.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abcc6067afb---rasijatuvivirigixo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=financial+feasibility+analysis
    • 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_off0000ea48.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 16792 bytes
font_01_sfnt_off0001025f.bin
bf6f622fb2c8f1acbf12cb65d360270b17bac33b5b9dfa02c12edaaf983c287d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1025F 10340 bytes
font_02_sfnt_off000119da.bin
40a7e97a5b264f438b5ef2b28fe4c70481e69c54d61f1e48f1182ddba2aa0eb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x119DA 17056 bytes