Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7bf60db62320f1…

MALICIOUS

PDF

98.1 KB Created: 2021-09-04 08:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d06c4d37d99f52d3e27d9b0b24cc810c SHA-1: 38db6bab859000ceb48af4d758516d8f61eed74c SHA-256: cd7bf60db62320f1d1fc0814dc9af776045c1010c29226df5b906948d45d691a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://biothiennam.com/media/ftp/file/60680013892.pdf In PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c694703c5a---bunepuxesiguronovifojov.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762edc15457---numamefikisijizedu.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/madapisejiwiwek.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609554cfe73fd---58823761297.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/09fab8b34efb361f127b4e6034a7d7b2/78294837294.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/gobivogib.pdfIn PDF document text
    • http://rvhifi.cz/files/file/kipaxufosafopuru.pdfIn PDF document text
    • https://purefeeling8.com/data/file/76417862776.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/81185968999.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/pidixu.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9f20247f2---napajanutagidiret.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608701a4f4163---famitevax.pdfIn PDF document text
    • http://exosushi.com/uploads/files/feropunojizuzuxaduji.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210805/files/20210805183523.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1610342334e1d6---71685298693.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/81490401639.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c704f234---lodukivowedig.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/sulikidulabilis.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612aaf2479304---diwumevipizufe.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/91477462415.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/notebaverunaxa.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/83b0180fb673b5c7ccbe988cc25d2d29/tikelemug.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/jnm7ikvlglf6mh4epjs1omjat4/fojanifazuwel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=g+shock+mudmaster+english+manualPDF 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_off00011739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11739 19544 bytes
SHA-256: 3f40e2a9c580a70d3b44deaa83fbf6bfd2193f0002ae133553e316f2609f4db0
font_01_sfnt_off000149de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000161f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161F5 11048 bytes
SHA-256: 0b8e93c14542d8a92f7fd77f85d4b1e7b50c48a9d94a1f3c32242bc15264503a

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