Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6c77c4e0f83fe4…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 22:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 33c29e571ab5f6a349bdf507b2dfa50c SHA-1: 023a4b93978661efdfea3cb401428e05b30c707f SHA-256: cb6c77c4e0f83fe40ee2cf6e61d51781313e5bfdbebbc6c651ee3eb6aad91668
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to compromised WordPress upload storage and other disposable hosting, likely to trick users into downloading further payloads. The presence of embedded URLs and the nature of the link farm suggest an attempt to deliver malware, possibly via a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609904f046d7f---jakilol.pdf In PDF document text
    • http://bmcsteel.com/uploads/baiviet/files/kifiluxatunefo.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/58631f959f64806ec900fcd110b48190/49791829487.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109010404564368.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/cbb3e16b84dd599e78bf3bff0e5293b5/84382131769.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/gaxeda.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/wodarelepuzoto.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/54c6229fdd692f122b171d4c0dd252ae/bubipezug.pdfIn PDF document text
    • https://activepymes.com/pub/file/66755127514.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/jowolewubu.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/reour6ojd3hk3e5nbttd1a4vrt/dakoko.pdfIn PDF document text
    • https://laps.pl/userfiles/file/72089726943.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/jesiga.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6faa89294cc593fa0758500b90043f98/93050231693.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/aad94eface9681c7b1085d7235e7dcff/jokexutizuvedizirexosewev.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210721175947.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76f7904ccf---xeruritilu.pdfIn PDF document text
    • http://ewtch.com/upload/files/gonaz.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e76a64055c7---rokop.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/fodonudalevidigejedide.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160940c617d5c8---24534550083.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/gizaj.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/83941819092.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/zetumogokifijuzu.pdfIn PDF document text
    • https://oferta.lt/i/File/feragumafosunuwoxexira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=convertir+pdf+to+pptx+en+lignePDF link annotation
    • 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_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 10544 bytes
SHA-256: a38014a8db7d771c921d25f115245a68b937215e13e6c67997cd4e5278718a89
font_01_sfnt_off0000eae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE9 17028 bytes
SHA-256: 20d6b4d47ae82794f945f1dad433298798d8107536c5ead6ec5c41fddef07ef3
font_02_sfnt_off0001173c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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