Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9eb568d54782dc…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 19:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16b628cadefa898ddd0a44ad16a50579 SHA-1: f81a15c73883fccd8bc5d862814ed6b41a8daa29 SHA-256: cf9eb568d54782dc69b4cff514d1f19189d23f8b5cb3807f1ef2e4569959f0c5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous URLs hosted on potentially compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a deliberate attempt to manipulate search results or host malicious content on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://paklya.su/design/img/upload/file/gevilujupudo.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f84d9575d83---42107348937.pdf
    • http://radio-salsa.com/php/rs/filesupload/file/90005225143.pdf
    • http://gyuco.com/uploadfile/files/20210828_040302.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c4e2d9991---manozuzejivo.pdf
    • http://bakoca.hu/files/file/10300433419.pdf
    • http://market-oborudovanie.ru/upload/file/xijujetoriduxonig.pdf
    • http://ecohort.com/userfiles/files/nijukedaparobe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5570753249---rejiges.pdf
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/64541866510.pdf
    • http://montaze.org/democms/userfiles/file/tuvodumotixova.pdf
    • http://cpspcb.com/uploads/files/24784416912.pdf
    • http://rpsbchamber.org/editorData/file/67381653715.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/fozebibewigamakejum.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/u7nkcoa3h8tvt2odiaadvsf9gn/83341186642.pdf
    • http://28777886.com/Lpf/UPFILE/userfiles/files/66905023544.pdf
    • http://go-pxl.com/uploads/files/66023744741.pdf
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/29791966289.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64bb42c41---79537625017.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d996bcd02---64377612958.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/vuxamifeferi.pdf
    • http://abnicum.com/files/file/bataral.pdf
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/wamununakirojop.pdf
    • http://livelyway.com/ckfinder/userfiles/files/3215059936.pdf
    • http://bocghedanang.com/media/ftp/file/deguvul.pdf
    • http://myrbacken.se/login/ckfinder/userfiles/files/tadoruwima.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=poe+abaxoth+the+end+of+all+that+is
    • 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_off0000e1df.bin
85366fbcb74acab39c6d0631c4d1f52c333b61d73ea889bb1c67891cf61f1a5b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 10596 bytes
font_01_sfnt_off0000fa01.bin
c619919e1d2e1d499239bee3083eb8b80619cb5f8c14d87e4295f8b20d233f4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA01 17984 bytes
font_02_sfnt_off00012800.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12800 16792 bytes