Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9de0b3e5c849828…

MALICIOUS

PDF

87.4 KB Created: 2021-09-20 03:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a0ece032b5f1255a2d0b897b2b2bbf4e SHA-1: 94108b7ba763e9cc7e41dce2efa20514f89d7b92 SHA-256: c9de0b3e5c849828fe320dce088fc84bd8f50b749e38735e716c8e7f2fb6272d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, forming a link farm. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further malware. ClamAV also detected this as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=pokemon+game+sword+and+shield+apk PDF link annotation
    • https://gencerenerji.com/resimler/files/11031927135.pdfIn PDF document text
    • https://europartner2.pl/uploads/69356129625.pdfIn PDF document text
    • http://esen.life/userfiles/file/28515881525.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/xefebijovutedegizi.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/72492977906.pdfIn PDF document text
    • http://rinsacars.com/files/others/josumadexubirovifoj.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/52292185886.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/20246740324.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/dosixojeketowubefaxekipez.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/fupewabuxekikibewovumomu.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/92145940908.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee8b340c44---41950924691.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131f5c5b83b1---sinowajufokiwidalujedum.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/gejegegaz.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/gijedabegebilinonoxaz.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/jizerudosidudokuwamegujif.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/xupuwepudurodifojujido.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d482886a66---51887640688.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/39474595726.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/78171256968.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/25861314460.pdfIn PDF document text
    • http://air-con.ru/upload/files/99843015218.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109200759034785.pdfIn PDF document text
    • https://ms02bet.net/contents/files/68994856176.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/sonisurulunumupo.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_off0000ebb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 19116 bytes
SHA-256: ed4cc0894a0f30666ba3378f30decbbc0fbee567e531092b7ec289e7c91079ee
font_01_sfnt_off00011d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D79 10920 bytes
SHA-256: a3356ef870113e2e05000b6f3467e018a7a6d07a7768ac2dcabf56ee8e7a4c28
font_02_sfnt_off00013668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1