Malicious PDF — malware analysis report

Static analysis result for SHA-256 199dca52775f1698…

MALICIOUS

PDF

80.2 KB Created: 2021-09-03 19:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92c621b07fc24f1e1fc3999afacde9b4 SHA-1: af5c71de02e932fb990ff9dbc785d19e394d7957 SHA-256: 199dca52775f169885e8dda5a0869343fafadd385d6f96bc78aee93a0a102ba2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=manual+taller+bajaj+rouser+200+ns PDF link annotation
    • https://noelex22.org/userfiles/file/fexakamebuxagoputo.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/298dbf93d9716ecdcede01e4cd09e69c/38500676199.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bd6497a0a---zopokuwi.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/gufomed.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/25832768108.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/73230520904.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/vamodowapibexovatonijusu.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160904c45aef55---93339157764.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/6391721189.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/10033506146.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b70b502545ca7fe088eb08967f872e89/nogevoludeb.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/riwajixikefakop.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/fefegop.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6a4080f4e---gepuk.pdfIn PDF document text
    • http://wawa757.com/uploads/files/94463163963.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/reson.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/71139900912.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5b3ffb8bd6d0bf261f1331e171e3437d/76027566730.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210522094428.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/8667452570.pdfIn PDF document text
    • https://nevisnews.com/userfiles/bavodawivukosukiba.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bca4744a2e4---96526131681.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/0628bcb040aceb2fe5d8e3e0800baaa4/31524696319.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67568e55a5---91442007993.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_off0000d1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BB 10616 bytes
SHA-256: 2f835111d1aa14eaf41052a20bb1db092deb1808dc5cfd8250f6994ff859ed40
font_01_sfnt_off0000ea3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 18488 bytes
SHA-256: 9d03e0bcae1c91aa45400541f7f326b8b59dac73a9e5ba8c26652d82472416e7

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