Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81027eed6eaae38…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 17:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e59c1b4e322e6d7417eb84f75e455d0 SHA-1: 58ee9a689d4ee5e145713482f0800e2b05948d64 SHA-256: e81027eed6eaae38321e2ca4373a2d2ad42aa7293c95e14bf197922f567fe9f1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4b522cf3a7cc1b9f42caae8108655491/zuborilena.pdf In PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/fivuwizenunidel.pdfIn PDF document text
    • https://efnnma.org/files/file/pepigewewesodurafimasope.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ef23e5fc7---60761112450.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/vivuba.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/37573199982.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/zixagaxusabubulepe.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/3440338362.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/pogad.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/pesatafibolosubax.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/92244793854.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/74226569417.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/mepineletidugawunesef.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/16479102874.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ijsrrntptgdm9b0iqe5iblt6vi/divivitetowo.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/vutoturogusi.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/21900584953.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/vubifaxiketakoz.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/91539253406.pdfIn PDF document text
    • https://panama4d.com/contents/files/tilekuxewuvukufamoxunika.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/79304477482.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/lilovuxefotokodufiwo.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/rujozipizadifijuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=crab+war+gamePDF 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_off0000df57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 10080 bytes
SHA-256: 5105009828c57c25cdce5ef287c859aa719b85bff3cf64896610aa76ca534241
font_01_sfnt_off0000f5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 17936 bytes
SHA-256: 3029c1aa235df275b7f3b3ed675ad5739702f263439590ed7265e924215abc2a
font_02_sfnt_off0001246a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1