Malicious PDF — malware analysis report

Static analysis result for SHA-256 6458c7f2d00d198f…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 19:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cd68bd24de8d4076bf0ec7422f772cb SHA-1: 1ccf13463be837864ea1c7ee94e99b2ea7178520 SHA-256: 6458c7f2d00d198f4fe0c91394e90e3e2bc007d31cb7eda9ccbb212ef30ffac2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised CMS upload directories on various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links to compromised WordPress uploads suggests an attempt to host malicious content or redirect users to malicious sites, disguised as legitimate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1614d47e42f74f---24851794104.pdf
    • http://bon-mar.com/fck_user_files/file/682931529.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/op8n0fk95lhauff3aedatt7gpp/guraravizatojuza.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8f1d80a6dd16099bc1bfaa8adab1fdfa/vagadokexelibodifuredoxof.pdf
    • http://vigova.com/Images_upload/files/wuxutiwarevenizuzinad.pdf
    • https://doina.md/fckeditorfiles/file/82100716930.pdf
    • https://wisestudentz.com/userfiles/file/81621482341.pdf
    • http://masan315.net/board/imagefile/file/poxexogodinagaxevi.pdf
    • http://driver-jazda.pl/upload/file/wakej.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/wokisu.pdf
    • https://idea-web.ro/app/webroot/files/userfiles/files/75384653049.pdf
    • https://cyberbirddog.com/userfiles/files/siwaku.pdf
    • http://wedding-box100.com/uploads/files/202109221320463823.pdf
    • http://mosme.org/uploadfile/files/60457942400.pdf
    • http://harekatmemuru.com/images/Media/files/romabipatubizedu.pdf
    • http://agrion.org/upload/fichier/33281915047.pdf
    • http://hurtglass.pl/upload/file/62324269609.pdf
    • http://buyo-g.net/userfiles/file/93571634261.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/b33587b681f63de20095d42446a59045/64717201409.pdf
    • http://viorina-deko.com/images/file/vubibatirizixetaxig.pdf
    • http://klubbelgickychobrov.sk/editor_uploads/files/27726340289.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161471e50dffb5---56335614782.pdf
    • http://lyzjkgm.com/d/files/kumavilu.pdf
    • https://sunrise-photon.com/upfiles/editor/files/gamenuwewozeniwesupu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=nova+launcher+7+download
    • 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_off0000b268.bin
9d0ca400313b09e707093957ead72b50494d81f35d616ff1766dad15085b7231
pdf-font-stream PDF embedded font (sfnt) at offset 0xB268 16692 bytes
font_01_sfnt_off0000dcc8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 16792 bytes
font_02_sfnt_off0000f4df.bin
3ea4d68382d57469f82a45b998dc348794575338b6709f09ab36207f9869068b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 10388 bytes