Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7acc4b14db74dfe…

MALICIOUS

PDF

88.7 KB Created: 2021-08-01 06:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9b7f8b09a44d0d7f42c07147cb04fff SHA-1: 5203c7593ba27613289f7e6c2ce5f3112bb54d86 SHA-256: b7acc4b14db74dfe2c7bb69f5a0df70e533170d6e4cdfe931c83943b0fbbac5f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The presence of a visual download button lure further supports a phishing or malware distribution attempt. ClamAV detection as Pdf.Phishing.Trojan confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/arlso4u8uao7ooqhqnrjeavs54/8659213100.pdf
    • http://jtour.vn/userfiles/file/64375898732.pdf
    • https://fzclicks.com/demo/files/editor/file/pepokozifefamesedupera.pdf
    • http://ambvetfanini.eu/userfiles/files/wuteno.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a397a5098b---xodopadivexaketavozat.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8f21bf520---95938802820.pdf
    • http://trustycctv.com/ckfinder/userfiles/files/10998633136.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/aa979eb80c34e54b92c585fb49040b0e/xifamabawu.pdf
    • http://chromavials.com/d/files/bewomirebumowupa.pdf
    • http://cs-web-design.de/ablage/userfiles/files/xozuwo.pdf
    • https://kajariaadsevents.com/admin/uploads/file/busivulevulajuvijuxoz.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca138125541---larasovesatizige.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79fa4d71a8---31622736110.pdf
    • https://skatrip.com/basefile/skatripcom/files/33528427932.pdf
    • https://codecs.roimages/file/dofezovewa.pdf
    • http://naucseto.cz/storage/rugekisukububixobusofufop.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dc0fed322---70652402601.pdf
    • http://adbuffalony.com/uploads/files/wodulirepowifovim.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/f87hjl1042bt09q1eb53f9era6/80523310439.pdf
    • https://energooptima.hu/upload/File/xemisegeneroma.pdf
    • http://oroblupiscine.it/userfiles/files/maginufutuware.pdf
    • https://newtech-utm.pl/userfiles/file/24379684909.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a0193fe3506---sozapa.pdf
    • https://okna-stv.ru/userfiles/files/bafadanunu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=synaptics+ps+2+port+compatible+touchpad+driver+download+windows+7
    • 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_off0000f2e4.bin
7c3eceff79ac923ada6074ca88d9fdab7831db154fa2c9cb7c55ba144d0dfe52
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 11532 bytes
font_01_sfnt_off00010df8.bin
43ad152ba706de7b55e309c2d120103495730e7a471a14aeb478f3d7c268fcdb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF8 17200 bytes
font_02_sfnt_off00013b63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B63 16792 bytes