Malicious PDF — malware analysis report

Static analysis result for SHA-256 df25a59b20929021…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 09:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 793915451f6e448c95b1a92184208b74 SHA-1: 63d3bc04f70f4bf0fc88316568e4c0d4fed741d4 SHA-256: df25a59b20929021390cd80ff75326b30bc14b4af66e4fe4d5b8bdf28c613ee7
156 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed to manipulate search results or redirect users. No scripts were extracted, but the presence of external URIs and the overall structure point towards exploitation for client execution, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://catamma.ru/uplcv?utm_term=shadowave+info+instagram+password PDF link annotation
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9f4ab3b05040ad529e6d7082f27b9789/34931251016.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/34dcf2344bcf0a588c0b72b233b4649d/gapewulujirorun.pdfIn PDF document text
    • https://csn-alliance.com/data/files/45989038206.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/molukowub.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/74901323944.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/14071683241.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/84673601713.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/88064755973.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/93717409563.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/55943563596.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1866ba673---fopijakixovokupojuro.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/pegoxupatikukizibudefom.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/jfqk5lv9bt73k01gkq9mskd2ng/girimaguvexufiwozekeferin.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/17383686605.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/90789699869.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/37699301516.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/jakomawixemewenutasoxolej.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/vimusurunupisuf.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614038c59e7ee---tapojojisiselukusogugo.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/sonudewejanuvofozijokix.pdfIn PDF document text
    • https://pecintajp.com/contents/files/84720755994.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/wapavukil.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/pexefolajixozimedepaxize.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/47797810125.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/35591507690.pdfIn PDF document text
    • https://reha.bg/content/upload/file/fisifetuwimu.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_off0000d456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD456 11124 bytes
SHA-256: 259d013f51f6b27b766f2b05cb0a28a59036ca5b544cb70a062aaed81e8ca352
font_01_sfnt_off0000ee00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 18152 bytes
SHA-256: f7eb005d63636aece1f249d225a752713ee30d3c8041032bad7e39b0c15845b2

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