Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40d6543537dc817…

MALICIOUS

PDF

78.0 KB Created: 2021-09-23 03:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6dca6c99490e835a4959ef97716cb746 SHA-1: 2616d8d9fa59b24e5b1ac62970b14faca5198dcf SHA-256: b40d6543537dc81751babf2c4ee6abf64560deae54e9c17c67b77ef470b6ef03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://wastran.ru/uplcv?utm_term=convert+heic+to+jpg+on+android PDF link annotation
    • https://gplacestracker.com/userfiles/file/binajotizegekedod.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/49525658c5149e1a9518e251e8082766/33522580968.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210922160952.pdfIn PDF document text
    • https://led7.ru/file/85388637966.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/73022006728.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/36240482494.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/wafunitova.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210913_161706.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/27188088492.pdfIn PDF document text
    • http://dkind.net/userData/board/file/wafogenumukigujuxuz.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/26294726588.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/61f6ff40f96928db86a683f42decc57a/31245692425.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/39740009565.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/xagadosudikugedekuzav.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/suromuxinimizem.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/34306529473.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/6075893306.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/lmhg616bjekjrelq1t0ctkough/38119898787.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/nuxegajanefuv.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/23246850030.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/6239495991.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/79890187554.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_off0000cc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0E 10804 bytes
SHA-256: 464ff6b03494a586b9d62b04d82489fbd4c2cb5a1b3b7c38dad1fe8e06799b8c
font_01_sfnt_off0000e4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 17908 bytes
SHA-256: ec34a3368fe2c523da73d8bb329e6cf8e6155ca099369fbd6dcdd049cc839adc
font_02_sfnt_off00011269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1