Malicious PDF — malware analysis report

Static analysis result for SHA-256 457c4cc4ddc49500…

MALICIOUS

PDF

91.2 KB Created: 2021-07-28 07:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f56d90dc682fa8847b4422a328cc07b SHA-1: 56fc7b7631a49ae9fd988018d1ecfa1e90fd286a SHA-256: 457c4cc4ddc495001b1a0be8ecf4f90e6803063707bdc4aa36e87796dd0f2f51
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised WordPress upload directories and other disposable hosting, suggesting it is part of a link farm designed to distribute malicious files. The 'SE_INVOICE_LURE' heuristic indicates the document's content is intended to deceive users into downloading a payload, likely a trojan as detected by ClamAV. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://short-story.ru/upload/file/72553587725.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/17e43bace8c66e8bd2638e469b5934cc/6939142745.pdf
    • https://cristalensi.com/public/File/86606967893.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/12f8c30c7883d6b393ad7efc8e894819/13318793721.pdf
    • https://glbtrader.com/userfiles/file/pisipifu.pdf
    • http://benhvientantao.com/img_duhoc/files/dadibovegufekavujijaxumo.pdf
    • http://mertlakustika.cz/images/pages/file/bukimogisiwigogej.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079cfbf6a9c9---wivetesonowewurewobe.pdf
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/80039499844.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088558457bbd---22148871600.pdf
    • http://greaterdeliveranceministries1.com/clients/61527/File/lewudazuzozisaf.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/137c4f21eb0596883742754e7000ab8c/35672400774.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a431d7614eb---wevedaxoxevegasugomekiz.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/8e43a210fb43a9d6c4433bacdae6f9b3/kuxara.pdf
    • http://alfavit.tv/userfiles/file/29060709647.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/hfj8hl9ajmk3fmhodnnclvg3m4/fovoziroduvufoloxi.pdf
    • https://fleuriste79.fr/ckfinder/userfiles/files/75944900973.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c664c57ffe---66434745009.pdf
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/ropipi.pdf
    • https://tekartltd.com/upload/files/46133859619.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c674be72cc3---98627071687.pdf
    • https://bazab.ru/ckfinder/userfiles/files/tenunifujofowaxadiseb.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd35216970---kobuwupa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+write+a+personal+history+statement
    • 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_off0000ffa7.bin
ee5b27651ea4d5212a687c3344c189e39dd40d0c6337cb599daab84f5b8f20e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA7 10708 bytes
font_01_sfnt_off0001180b.bin
aabfe63702163dc278a7f8a38465ac5d41263cdce5fd7806ce501466053473a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1180B 17344 bytes
font_02_sfnt_off000145c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x145C1 16792 bytes