Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6a5b44656a67c4…

MALICIOUS

PDF

102.9 KB Created: 2021-09-07 10:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 379d9a873fbac1c8209b5a64608eb742 SHA-1: c19b20839cfa8c5210e5790a1fed0bd6ca42c0be SHA-256: 8f6a5b44656a67c43f5d1b41d18fa0233b4522e8ab7c40313624ef1e77bdb435
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://ketchas.ru/uplcv?utm_term=ddex1-01+defiance+in+phlan+pdf PDF link annotation
    • http://hicoweld.com/shop/fck_file/file/sadoritirof.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16107258cb74d9---rigexiluzuva.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160783579c5eed---puwimubopadup.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/70468925327.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/degeforebubepinuturug.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/17319418418.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/joxoxodebapoz.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/58293608713.pdfIn PDF document text
    • http://atomleasing.ru/media/File/duxeka.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/71528286437.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d69067c6be---74520611295.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abad97633c0---wuzimewumoketelil.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/josiweku.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/15275940880.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607016efe5292---junope.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/jalomebuluker.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/muwepemetubufere.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/28066767728.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/lubuteponefotakanomigejo.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/u5cnvpntmmmbgrnn459j5qm5lr/vajikapufuvog.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/xoxexipolosadi.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_off00012c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C04 10540 bytes
SHA-256: 11e05aa0255782e93f0240a06cf3ef73d6f6885d080472566e8a89e9353f79e6
font_01_sfnt_off000143fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143FE 19372 bytes
SHA-256: 2bbd438f2b592d1debac5bc3f1e8544ea89fa93bd2c9218d1f6846aab86663e0
font_02_sfnt_off0001761e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1761E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1