Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf13338402d2eaa…

MALICIOUS

PDF

147.8 KB Created: 2021-07-03 03:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe1f78f064087e3bbf0d9112a0b16b18 SHA-1: 196e18d4e2adb76cf4a263681cae0b44524a0141 SHA-256: dcf13338402d2eaa6cc69e9defe96359933022f77fc81faf65a4157dcd585a10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it functions as a link farm to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://kaizenlife.com/ckfinder/userfiles/files/sofumuzoki.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/dab4314aa5bb693cc8c6e8ba6d602488/pavomuwesudikez.pdf
    • https://gonguyenkhoi.vn/upload/files/gurugonij.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/juseruwopedozep.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/4667457abf3b06ca07d932a65a1834b9/91513381755.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8bffe6cb4334c4bd963455d4556c178f/gexagimodejunebivavama.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609476bac8f5a---rutibuvatesisupexamefala.pdf
    • http://jpind.pl/userfiles/file/sivetusojavan.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3fdeedf20---jitogarunizaxosisiwuma.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/mte5fp5hu6ce80r41adottim34/25249429757.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/d0a4a692f994bac2af826f196b5407d1/96772484944.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6122f6aa659b355d29018ac080c0b59/xalarisegabagov.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/9uoirn757qd3h8bk5s8ue5ra64/xoraporofijadaril.pdf
    • http://uco-kampen.com/media/files/78271552073.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/2a0b5d125934ee2272ef5b9573aabba6/35779941074.pdf
    • http://wskinbody.com/data/boardData/files/52315437106.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb60278598---19409378284.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c95ca6daae9---xarixapulesedatozikosari.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f513272dbc---85457988097.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074d1a6d65d7---vagematoma.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/a3ke473r932bdeo66ggpjb23hr/jolutatuvo.pdf
    • http://dorp.pl/userfiles/files/tejajenufevofisazinugidut.pdf
    • https://digireg.sk/upload/17178536868.pdf
    • https://daxitrip.com/basefile/daxitripcom/files/pebewi.pdf
    • http://reelproductionshd.com/userfiles/file/51698449911.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=tending+to+attract+attention
    • 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_off0001e06b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E06B 16792 bytes
font_01_sfnt_off0001f882.bin
ac0cfd4e9b3ae4ccfa222dc43fb83292776c23d9f258cc8f4c306cf677e99931
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F882 10292 bytes
font_02_sfnt_off00020f97.bin
711266f7bc6edbb48474c19ac355236a39d3e23ab4f93b6405c414e85e4b43c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x20F97 18700 bytes