Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f4e819d636ce02…

MALICIOUS

PDF

73.3 KB Created: 2021-09-20 22:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d0e422f7834406bcc016056146eb667 SHA-1: c0a82bc09946d5e28473b5704abf7cfe7c885739 SHA-256: a7f4e819d636ce02027e2917757b76af4d3d7b832f3a15e904d7a99f114b7492
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised WordPress upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pasifikendustriyel.com/userfiles/file/kikigivabemutonebugukenom.pdf In PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19831704448.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/tefuji.pdfIn PDF document text
    • http://www.bandungmesin.com/file/vujavuselobiliguwopur.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210918065928.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/25075151846.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/50401475301.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/xedufi.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/57297256178.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/dewukesuzu.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146dfd5cb5be---25113659340.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138fb1db2b1b---74737682498.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/pulopoge.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/99302574899.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/mumuzuvuzaripiwu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613afade26e93---41511940827.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf0dfd671b---44263964426.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/69561163605.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/wonemekaxegixizubazula.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/tofoxuzunaguxemiju.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/8391430287.pdfIn PDF document text
    • https://assofmt.org/ckfinder/userfiles/files/xokakosanogunawes.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f98f4f0a7a---latisakidaredawirikodoki.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/giduwotedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ben+10+protector+of+earth+ppssppPDF link annotation
    • 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_off0000b99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99E 17532 bytes
SHA-256: 0c5585e90954832bf5ab1b2e2c6bb273b317b6b2cca42962d36789dfb0dd7c82
font_01_sfnt_off0000e738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE738 10668 bytes
SHA-256: b9843a96c912eca156e5dc6b57cede24d3ee268258a15537955f7a053841cd28
font_02_sfnt_off0000ffad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1