Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92cb43cefa12a7a…

MALICIOUS

PDF

84.7 KB Created: 2021-09-09 00:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1be475d7c5a3173f2b48fc105a015b99 SHA-1: e347abae7d98a7c49d3f338618ea36ed7ca092e2 SHA-256: f92cb43cefa12a7a77257d00b8d60c837b485e636b321e9e2f20448e924e40cd
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, including a link farm on disposable hosting and a link to a compromised WordPress upload. The presence of a 'download button' lure and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a payload. The ClamAV detection further confirms its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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.
  • 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://wastran.ru/uplcv?utm_term=windows+10+free+download PDF link annotation
    • http://rosg.net/sa_upload/userfiles/file/20210901075338.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/62946848588.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/sipegisepuk.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/komunixejamawe.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/46640191960.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/4457245723.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c92294ea9---jopavugulidazoriduvelobo.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021941410211014.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/kipufozafososelogava.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/resuvogurejef.pdfIn PDF document text
    • http://modern-pro.ru/files/file/99425562929.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sawezazexibixomuf.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/62896011473.pdfIn PDF document text
    • https://tmtteks.com/files/36786200584.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/48772918394.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/sigatujusupekiganipigaluf.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fafed6a4a6---5880868847.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d60d92105---suketeximu.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/gazofu.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/97086049439.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/11096766894.pdfIn PDF document text
    • https://upaspor.com/resimler/files/98037472564.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_off0000e620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE620 18488 bytes
SHA-256: f9bdd252a387403a755286d5e04b11e2d33f3083c967e042da477aceb8779762
font_01_sfnt_off00011557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11557 10504 bytes
SHA-256: 7b74fbbad1b6bf46f3d2a49095f51003c18a0743e217469c60947e9256aa624c
font_02_sfnt_off00012d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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