Malicious PDF — malware analysis report

Static analysis result for SHA-256 64dda81a070fc440…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 11:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3fe5a4f6ac7819c810de9c7c188cb1e SHA-1: fd7e286f036dc1f2680c8901e3752ad450fcaa9c SHA-256: 64dda81a070fc440ec92b0e9455409fa91753742f6338cd0a1049ab0c4dd5db8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=android+handy+gel%C3%B6schte+kontakte+wiederherstellen
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/77928373866.pdf
    • https://eko-briketes.lv/userfiles/files/98785738040.pdf
    • http://alocainghien.com/uploads/userfiles/file/fazomimelolegapewobedos.pdf
    • http://medrea.ru/upload/files/wubodexagokolanani.pdf
    • http://esistore.be/userfiles/file/gewede.pdf
    • http://poney-club-romilly-aigre28.fr/userfiles/file/27676223399.pdf
    • https://aodaixuan.vn/app/webroot/upload/image/files/93938687347.pdf
    • http://pogologistics.com/ckfinder/userfiles/files/xupigimavite.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/32uffgl454shdh6ld4lemdpl3u/poxakuriluwida.pdf
    • http://imoroz.by/upload/file/rojatudevukazu.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c5eb14e1---14405608415.pdf
    • http://anbao.vn/uploads/userfiles/file/11237805160.pdf
    • http://melodylavernebettencourt.com/media/file/77280206909.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134990bd39d7---36091447127.pdf
    • https://emenu.hu/editor_up/10984162833.pdf
    • http://jvcc.cn/ckfinder/userfiles/files/2109111548363619030ikgi.pdf
    • http://ficfart.org/userfiles/file/8006194228.pdf
    • https://onhimalayas.com/ckfinder/userfiles/files/14751161274.pdf
    • http://aviafond.ru/userfiles/file/jimazaridolopogejox.pdf
    • http://www.atsamuihaus.com/image/upload/File/29608745590.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9de83b97---padijefavob.pdf
    • http://www.ctnphrae.com/ckfinder/userfiles/files/77221107700.pdf
    • 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_off0000d225.bin
72345d8a9b7e006194f40dc2cc85cd1a32c1e35006d5099d678b999dc25f3ca7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD225 11136 bytes
font_01_sfnt_off0000eb9e.bin
33d72a7f5c782ce1be893cd66fc53b761b7769023212cc510270f73b8d6d0b38
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 18616 bytes
font_02_sfnt_off00011ac9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC9 16792 bytes