Malicious PDF — malware analysis report

Static analysis result for SHA-256 53dcb7e4a46932b5…

MALICIOUS

PDF

82.6 KB Created: 2021-06-25 15:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0abd57d9ee4e7dda496cb2330eb2e2b3 SHA-1: d777a831aae1ccea1e381d3be21f83c3db8ccf3b SHA-256: 53dcb7e4a46932b55c54d4e38efbe8ad5f21e56df6b71214558fbab1273d5291
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/93u3uavvrvj41iiiv2946e4e32/29428041330.pdf
    • https://mimpiindah1.com/contents//files/bibopobamegugubor.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/fe03rf5mc2bu59p8r7d47v1d40/limibudolawofugi.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/3009d943a4a41e1fb46e475097712bdf/13329130412.pdf
    • http://files.ibiza-ferien.de/file/jebedabofek.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0d748e7c7952ffb44ba8404014a7dfd6/58630851868.pdf
    • http://sakem.org/userfiles/files/28573721332.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607943b361f09---wiled.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7d343a805---rumapezepolebo.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5018689c02---96590674147.pdf
    • http://rheinmotel.com/userfiles/file/rojeralusivujogijemam.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/57592905142.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c88476d3e2---pixezavonudafixopa.pdf
    • https://nslogisticservice.com/userfiles/files/takusuvureroze.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccca81f9f0---duxivesuxaxozazevezubavit.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=can+you+start+taking+birth+control+at+any+time
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddc1.bin
4a0bc5211fbe8570e4e6998fea10355e62b5835514deb5e9ac41da368b1f579f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 17492 bytes
font_01_sfnt_off00010ba8.bin
1cb728fd8ad662db3d4660ca96fcd6f816e5198d6da1f9d55ef8b27b9e4a50bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA8 11156 bytes
font_02_sfnt_off000125a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125A9 16792 bytes

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