Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e01526b4b50fd1…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 08:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 34e6a6622e8e2237d4dd13ff591f1d75 SHA-1: 149593df8ffa1cb5d256af670573b32fc25502af SHA-256: 05e01526b4b50fd1fcbd268256d756c217ccedd89df42cce2ccbfe4419516e7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicates malicious intent. The document body, though heavily obfuscated, appears to be generated by wkhtmltopdf, and the overall structure points towards a phishing or malware distribution lure.

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://pistant.ru/uplcv?utm_term=merge+two+pdf+online+free PDF link annotation
    • http://myxroad.com/upload/userfiles/file///26110283491.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/83fc9338b9cec26a5dad780289d103bf/rebowepekumaxokubanekan.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/xanikesi.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/xusab.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/20376898562.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/buvemivinijuludabopu.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/20306857995.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/218aa3ded699248989c976646ed292d7/fovonipedopedobajasu.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/48303093903.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3b785fc45---povaxenuwilewa.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/6285007074.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/41928240839.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/vatukala.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161053e590ac3b---86058224141.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/tarasivetodamiwupufisezi.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8023be9fd6---44819117764.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/91122209769.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/lalodanaregujunelomaj.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/190a4cbb70f3f8a7e53919b824bd3e59/26151882482.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/papaxomekeresezogatu.pdfIn PDF document text
    • https://ka-base.no/images_content/file/60895854804.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/jisexerabafatupel.pdfIn PDF document text
    • https://olterus.org/contents//files/93396614191.pdfIn PDF document text
    • http://righetti1970.com/clients/872956/File/11249828163.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_off0000e0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F7 17612 bytes
SHA-256: 82cf917c8e00747676116f088ce5aac43f62c5a5b8aecf490a8e3dc811c3b0bf
font_01_sfnt_off00010ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FC 10420 bytes
SHA-256: d37154df271ee16e63447991d7177303d2b206c4f83fce9022a7ffed8be9a28f

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