Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1c6367268c47f2…

MALICIOUS

PDF

83.9 KB Created: 2021-09-08 09:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a0ff964329205d1db589fb03e448e882 SHA-1: aafb42bd7a2872d246c6466e98d75bf56ae5507e SHA-256: ce1c6367268c47f21c9b1a39ca9da5fe0954f0a92a583380ee44072df7bd4ada
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure but reinforcing the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=pdf+to+jpg+online+converter+300dpi+free PDF link annotation
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/63670701198.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805c9657f6f---30199377588.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/nabuzevarira.pdfIn PDF document text
    • https://fishuntpesca.it/file/19540076683.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/69670218259.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116ba66a0e46---vipiwupulaxapo.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/75241128314.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/18881386479.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/rojakef.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/kulizifuketab.pdfIn PDF document text
    • http://riph.pl/userfiles/file/binebinibitise.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f61eb2426---14486261726.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/6781682088fvqqefs0t4l407ss/nutowerevuz.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075d5b28c85d---97330354434.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/bukolesurixiragiwikub.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/67386284279.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/81758020940.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/33277471233.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/3dd08bf0800de9b43b9270ad3c9bc246/sugukenazikapovikix.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/65922949157.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a86feb7b74---mekof.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/43ea1d2c46c6dc33295ca2d40ea7901d/48756910220.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/l48cbi81b3tefj3b1k7uahm7p4/kulidufuleluvezitefu.pdfIn PDF document text
    • http://alptw.com/images/files/mumiwuvupanukiwuxon.pdfIn PDF document text
    • https://p87.hu/files/20795737676.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_off0000e499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE499 10956 bytes
SHA-256: 467c6e5561764cf491c8d9bd6ad1a2edc3bf3204a41df2469f0e83ad750bcff7
font_01_sfnt_off0000fde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE1 17068 bytes
SHA-256: faacccf6330f4cfd754de5b29e35b94e4f3d16ebf9f526294d5a0190f06e50c3
font_02_sfnt_off000129a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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