Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fedf87419eb3968…

MALICIOUS

PDF

76.8 KB Created: 2021-07-04 23:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53196c2159de616ce3ee8f9e281b4e8c SHA-1: 3f55b10ab51a2c6e17743a260c1cadd7a935813b SHA-256: 9fedf87419eb3968aa10c08aba790a19bc1fa5ac0b75455aa1af8ecb9e36b7fe
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple distinct hosts and a link farm structure suggests an attempt to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8d6b660ae6ab4b66446b40d80bdd7bab/5989499067.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7ba0140ae---vatirupuwabeso.pdf
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50913806942.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed5f6df6c7---zojedawasadipuxe.pdf
    • https://mamo-tato.ro/userfiles/file/redape.pdf
    • https://actorconseil.com/files/file/87223393975.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/b80360d44cdee064c119dd8797874d99/jadupafidaloxurarisumane.pdf
    • http://canadanur.com/resimler/files/90225817868.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/rpkm3drorfprbk86hu8cv2v2ed/4805007632.pdf
    • https://aljuboori.com/userfiles/files/gelopivesusorezolawu.pdf
    • http://anatolianlgs.com/userfiles/file/tetatanerunokegoja.pdf
    • http://liebherr-tr.com/userfiles/file/kuladafazubadafodi.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8208dee45---wimujanarezovajesova.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722c4e6daab---48146672010.pdf
    • http://alfavit.tv/userfiles/file/pesefu.pdf
    • https://armenia4d.com/contents//files/nojezumugasedisepujivexa.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16070f7f596597---85965352159.pdf
    • http://futurepoolandspa.com/ckfinder/userfiles/files/gekosetowa.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/78164764885.pdf
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/bemulaf.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c569bf0f241---romudijesanut.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081fe6850eb7---kogavenuzulutirefe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=candid+cbse+textbook+of+physical+education+class+11
    • 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_off0000c59c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC59C 16792 bytes
font_01_sfnt_off0000ddae.bin
8fa64bbcfecbbab7685c1a6548076c4a19e9883e2af7368b7d0c7ae55de6221f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAE 16828 bytes
font_02_sfnt_off00010967.bin
9133a4a7eb32f05852ac017f8d415588bbde0135d3cecfea9b78016250d15512
pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 11248 bytes