Malicious PDF — malware analysis report

Static analysis result for SHA-256 b772f84fdafcee45…

MALICIOUS

PDF

86.8 KB Created: 2021-07-03 18:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d66101b752b650e58ecbf7dc06579dd8 SHA-1: b322859cbbc9b974202adee0e33e51d4f352b01a SHA-256: b772f84fdafcee456bb08c5ebb1aeb2764a951f2949997448e1293b2b872a7db
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to potentially compromised websites, indicating a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially engage in SEO manipulation for malicious purposes.

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 https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/74aee915dd3f47753b4ec3de7489974c/deropipadagodezaw.pdf
    • http://sun-tes.ru/files/file/paredifuvonotupaluso.pdf
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/xosadojoj.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/426d978a682d39d6bdcbb9daf1978c3b/39945577160.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ace46aebc5b---kisavufomonuluxiw.pdf
    • http://laros.cz/UserFiles/file/pasom.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a2023081147---mipavonoxufewopisa.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/nc7615f35r152u2m94m4i5oafu/jikonag.pdf
    • http://sanruou.com/app/webroot/uploads/files/94222040516.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/69427068796.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f30b62714---pegis.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a980a93f24d---gopotasivefumamunejone.pdf
    • http://feg.vn/uploads/files/dokilazaneji.pdf
    • http://aeronautike.com/userfiles/file/34893065795.pdf
    • http://immobilieninvestors.eu/userfiles/file/jivurefapum.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915e5f43b9d---50748520993.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/86fb0ed562471765cd012113ef35191d/podezotepotejirurabepe.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb52e8283e---xezexefigedetasisa.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e628a423d---lonanutemiso.pdf
    • http://domholidays.com/userfiles/file/20669323333.pdf
    • http://kusadasidentalclinic.com/img/userfiles/files/mipofebasamevalisagevenu.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/f2a0ee2c56715d9b1f5e76c0ee8b57b2/fixexesabimorife.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=choose+the+correct+option+and+justify+your+answer
    • 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_off0000ed85.bin
0080f5ae75adcb84422bdfe1c5ca6f4cbf8e0136264d686d2651e543ee22c761
pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 17516 bytes
font_01_sfnt_off00011b8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8B 16792 bytes
font_02_sfnt_off000133a2.bin
81fc6c58855a043552cf1f65428d1b9bfbc08cad94d17940049bc00c3f1ec851
pdf-font-stream PDF embedded font (sfnt) at offset 0x133A2 11132 bytes