Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d9f1df1fcc9847…

MALICIOUS

PDF

84.2 KB Created: 2021-06-28 21:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1527ca5ad434ac7736945bee7e9e69e8 SHA-1: 9c418b17fdb4bf27b0b6f84f1f88e92d9901cfd8 SHA-256: 84d9f1df1fcc98475b57057e29bf73195230b332175629a6401eaa0cf426d2ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple unknown URLs hosted on disposable or compromised domains reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889c535419f---34723753772.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/937a461fdbf67f10e6bc6877b437ea30/luvanur.pdf
    • http://diversecityuk.com/userfiles/file/22304492637.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b29cc28b3cb---72602718965.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/743dd136e0cc2c0fba5eadc97c10c2c7/fopubarebikoja.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/s30utjki4v42mlc185niv84thi/66778240750.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/45360590353.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/lgaug354dodmmfr9qbdcqps5c2/biviwolelibe.pdf
    • http://ackerviewguesthouse.com/userfiles/file/14505261504.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/lqc6fk4v79kioka8k16ncbppk1/vogujifupaz.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081311093249---fogudav.pdf
    • http://jullien38.com/ressource/site-image/files/94061697848.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/sjcgf657spt416df44oblqnu1t/lesaradaku.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16098cbf1deeee---buzerovugaxarixugifidekus.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c37809f9c---wafowu.pdf
    • http://capmar.eu/userfiles/file/45818945825.pdf
    • https://etimes.mn/uploads/files/36262068141.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8381dd7282ba1a7e281f9fc54a69f459/javilebosoz.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/821hj96p4i89v5uj3hb92or492/58635863945.pdf
    • http://volamtuyetthe.com/userfiles/file/32609417655.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160878de6106e3---palokujudadavufuwete.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/98e5bbd735c74e792ac6b1f3d9b0c8be/23237468983.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=puffy+face+alcohol
    • 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_off0000ebd7.bin
2192b9d48c96dede3adfb06c1ff4d43074233eb691acb04ba35ffce712abd75d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 16092 bytes
font_01_sfnt_off00011548.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11548 16792 bytes
font_02_sfnt_off00012d5f.bin
c2506272d0b858c7dfb5c486655e12e30742fa22714e185b83edc6ff23586449
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5F 10088 bytes