Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df8abc59c818e6c…

MALICIOUS

PDF

82.3 KB Created: 2021-08-28 22:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d2fb29901c5a72e985b4b3d920a4c92 SHA-1: 46703b995e3d9ffdb8083c690f6460a65512c32b SHA-256: 4df8abc59c818e6cc46aabfc7d0f8e058798e13e82813e28fe367d169e4087e0
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 it's designed as a link farm to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, with the file being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b53b2ad3dc---16325126356.pdf
    • https://baongochoa.com/upload/file/kujebaxofudadajege.pdf
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/sodemuji.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/69b894d224373b5e70e000d5f99c777f/99321565611.pdf
    • http://cloverdiamond.com/file/nosedalal.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876f135c7e1---dezeviludemezan.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/eo48ovf0os9qhus53ldph8m5u1/melekejezile.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/935b1427a4dacdb155c90b7b53683884/vagiravixavigivevape.pdf
    • https://eric-parnes.com/ckfinder/userfiles/files/90113161736.pdf
    • https://drproperty.in/userfiles/file/91779344859.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e392864c92780e16f1ea0e00cc6ba8f1/83499985326.pdf
    • http://efuturesthai.com/uploads/files/9300970978.pdf
    • http://petraifevronii.ru/ckfinder/userfiles/files/98243982797.pdf
    • https://mayxaydungthienlong.com/uploads/files/files/maxubakipijesi.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a019a5a3fc---17658929169.pdf
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/82393182254.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d387ebd34---kinefi.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d668b90b088---98129892979.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d631e02e84d---48113115860.pdf
    • http://ajarnveerapong.com/UserFiles/file/vizibukeb.pdf
    • https://niboparis.com/upload/fckeditor/files/jadogudateramuwo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=bible+verse+on+grain+of+rice
    • 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_off0000dd1c.bin
39de9c3411c658121cee4215dcd8835c88b85afdfdb9f86abfd308eb09cb2a8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1C 10672 bytes
font_01_sfnt_off0000f5b3.bin
3405c30cc0773fc1198a1489a221a14ccded8ad7964b2056538640d6a93538e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B3 17696 bytes
font_02_sfnt_off00012328.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12328 16792 bytes