Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5fb16108aa20225…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 14:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 507ab03c3bc6cfb456e15200efa4ef4b SHA-1: b412001f228e0902e75248bfaf7dc2fc7ada1f60 SHA-256: e5fb16108aa20225e94e6210a73572d348d407b7b7be5ee4c874e66891e364b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a strategy to obscure malicious destinations. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=unique+minecraft+house+ideas PDF link annotation
    • https://almuhja.ps/ckfinder/userfiles/files/banaxiber.pdfIn PDF document text
    • http://medica-brno.com/files/99506539447.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210902060024935189dh27y.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/siwalazojoje.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/65004648273.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/92491974620.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/58268883694.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/nagegedezikivavejopupe.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/tipitofawafaloruxipux.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/89150028706.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210909070959_bawi2o.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/38231107464.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/refeniwumisejatol.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/gekosixuwitebes.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/rimaxozop.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334eeb97df8---75161081057.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/21066228436.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/19268113948.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161365f910d80e---xonofituloxetufesanowozu.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/geveniradawefu.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/wisivig.pdfIn PDF document text
    • http://novafish.it/userfiles/files/siwuxodo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613335a486ff0---25828007556.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3d158bf8f---wonakapanovufizadip.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ece5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE5 17192 bytes
SHA-256: c901afade8bd58660267226ca19781b4cb0649d7bda07cf9dbce8a1ab27a0ef5
font_02_sfnt_off0001196c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196C 10948 bytes
SHA-256: 6df12a81f5e2237836a9ab35601a3996f048c1bb4a8764004754b8ff57866166

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