Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade44c1bc8790166…

MALICIOUS

PDF

69.8 KB Created: 2021-09-29 13:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: caac6c4254e1354b2b7d48fc99a6e207 SHA-1: 65791e4873a6caf898da3b960fafc6fc405ee6e6 SHA-256: ade44c1bc8790166de78886a9acc3a2a61ed30bf78a5c30684b406dc08dcbfb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites or disposable hosting. The presence of external URI heuristics and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://medvor.ru/uplcv?utm_term=free+credit+card+generator+with+real+money PDF link annotation
    • http://cokhiminhhien.com/media/ftp/file/77364305648.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/wodazumupo.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/31598237345.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1612efec5a07b3---susiverozasirufonupabules.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/tejesodidusexosawidodiju.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/73581004820.pdfIn PDF document text
    • http://jjteriyaki.iorderfoods.com/uploads/files/xepotese.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/sugerozaduz.pdfIn PDF document text
    • http://voijin.com/userfiles/files/99766898895.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/xifodomukegimedirufulona.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/53677435197.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/30883401515.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/dusaxopipodoje.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/bawoporu.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/fafojajos.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/sarupa.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/siniluvudisedot.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b197dda00a---19114021614.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/41146122309.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/zopag.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/zajuj.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141d7c571e87---xomex.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/rufuse.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/97584436750.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_off0000af33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74A 10828 bytes
SHA-256: ddda760e26e1d297fcdd9cd318bc99f8aebdebaba3ffd2a6c1045449088b9afa
font_02_sfnt_off0000dfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE0 15596 bytes
SHA-256: f07b91fda03284ba9bcf24bb1306f3d49182f156efc39a4af9d994437db69618