Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f293a60d34e59d…

MALICIOUS

PDF

83.9 KB Created: 2021-07-05 12:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2c93d5506bd245df57cae4be46c526e8 SHA-1: e54ecb005da036de16f331ac145afc16dad8ee7a SHA-256: b7f293a60d34e59df925dc83add95f2eb492be66e8515d42cdba111b6acdcbf6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content or phishing pages. The file's structure and the presence of multiple external URIs strongly indicate its use in a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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=marble+gray+eyes PDF link annotation
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/9660db120aca6142a83438ee57b25ac4/setosovixod.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081302e309e9---reminof.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c63a5d9f290---nugerapo.pdfIn PDF document text
    • http://tyextractor.com/d/files/ravanuz.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb0290330b---poriwasukake.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/baluxukebunavokopoko.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dd7beb89b---rajat.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/9609904089.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/0685d6ef00b378ac0b4515ce8f28ebd2/narugazobebepujexukex.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210505010235.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/1ealq8adn1i0pq1d0goljghbh4/3274434266.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210603_DA5727F851EDA079.pdfIn PDF document text
    • http://namngonviet.com/user-/files/wofujusuzonasikifudufo.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/227dee1b96cb73b6895e15acb93312da/pogobogezov.pdfIn PDF document text
    • http://abpaluso.com/upload/file/19986553695.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/9991d8875485fbcc77fd6d8932a2c1f9/33177217729.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f078fdf2---12624733020.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1c2a5c3552c4b995f0bc325f0d7cb22d/99819878809.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/75641274333.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/21793765213.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/57230890290.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_off0000e8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 16700 bytes
SHA-256: a536b37c5c5d827b40eda965b514a66e68fa5e4944171b51761cb038e087e5cf
font_02_sfnt_off00012c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C54 10116 bytes
SHA-256: e26371fbbf7402aa769af3896ba8e2435bd24e8e0295e1f5673d5dc3f00b735e

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