Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b4573deea48d93…

MALICIOUS

PDF

94.8 KB Created: 2021-06-28 07:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1884ec07a87a7cd2be2aacccdc09b6d SHA-1: cfe3dde2fdf0fa4844d6d804dc2e834aa95ba8d7 SHA-256: f7b4573deea48d931aeff3a4a0e20e2a3c8c6701b5b62839ed044caa8f19d5ad
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised websites and disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple distinct hosts and UTM parameters suggests a coordinated effort to drive traffic to potentially malicious content.

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://huntic.ru/uplcv?utm_term=federalist+papers+in+modern+english+pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f008f0e91f---86354871746.pdf
    • http://nitexprofi.cz/userfiles/file/31123740025.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b994c93aeef3d10be4db89cc638c2e8/81169469279.pdf
    • https://muratay.nl/userfiles/file/gasevidonalit.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/5c58265696b913036d36cbdc3a197ba6/56733014785.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2e7e0d221---68964586367.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc43e15cc1---fojosub.pdf
    • http://gabortech.com/admin/file/73970711796.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3acb99deeb---mejet.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/abca339e317bc0c17441eee161d6154d/nebisifojuta.pdf
    • http://4grd.com/cmsimages/file/dapukurodatopaw.pdf
    • http://sirmamedia.com/ckfinder/userfiles/files/40862366287.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/2682876642.pdf
    • http://93564497.com/userfiles/zidarusixunisajifuxanefeb.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f635bbf136---fitusagin.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917efb00bb0---nuvev.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/524083fcf3279405838d00245b0be575/5288745018.pdf
    • https://abofahed.com/userfiles/file/39046894360.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ccd136536fbd95fc6d543a8d91c9bb07/kafanisujafutibef.pdf
    • http://booklandbooks.com/userfiles/file/vikepa.pdf
    • http://hodinovysoused.cz/upload/file/96695497326.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/torera.pdf
    • 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_off000111f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111F4 16792 bytes
font_01_sfnt_off00012a06.bin
4ab2d1626bb0e2f3cb81518779c54f1dc180509b4cc595651b7f6e2b4ee5c316
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A06 16720 bytes
font_02_sfnt_off0001552a.bin
1a26a96c8f00bf26069b9f5fe5d7588ceae92b4ed5d0718dc37ff87899e97710
pdf-font-stream PDF embedded font (sfnt) at offset 0x1552A 10924 bytes