Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f99b320754132a8…

MALICIOUS

PDF

84.3 KB Created: 2021-09-19 01:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 55ed896f846256d1782507e54fe900ac SHA-1: cb4dbbaadf59e0b96e6d22f57313e698eb1fb070 SHA-256: 4f99b320754132a8d7d176e2d589d007d9088d56967f2c2dbe8359ec0d9d6882
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and link farms, many hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. The presence of embedded URLs and the heuristic 'SE_DOWNLOAD_BUTTON' further support the attack pattern of luring users to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=a1+movie+download+isaimini PDF link annotation
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465e70641c1---94293543835.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/77107592838.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/69164023271.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/bavaxopajav.pdfIn PDF document text
    • https://duel.pl/userfiles/file/45526072078.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/moxepaxalegel.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/80932688473.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/38234566218.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/75148718567.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/nemomumexekiverunufe.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/88256973068.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/tizobasuxewiponufapibud.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/kovafotikebira.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/xizotib.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e94673f307---78791766993.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/merobudikejowikaretoliva.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/94b1084855bc2b7c3e1f3f82815279e4/17391249254.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/redek.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/nubezewa.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/daleziwebu.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/24119382566.pdfIn PDF document text
    • http://spiregene.com/image/files/20210905_064424.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/60784494577.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/zedobafafodukexis.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/50995965615.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_off0000e6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F8 10396 bytes
SHA-256: 4967746b149e9577110342d02eccf8af56824281c6cb6f330a49989f317592db
font_01_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 17256 bytes
SHA-256: abc2a4a104ffe004b22afa427a188533168d0b8abeaf38c703adfd1fcbdc88d7
font_02_sfnt_off00012b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.