Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ab4c317b970e7e…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 13:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 990282a2b457dfa0f2e9f9b890cf1437 SHA-1: eb0a108a0c2ef330b9942db5bd0f7546adc547c2 SHA-256: 58ab4c317b970e7e7383d5d94d4a7bab596bbba5e31287616ec93f5e2af00a62
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into phishing scams or to download further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://elhammagazine.com/ckfinder/userfiles/files/jawodifobidazixon.pdf In PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/45665302896.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/dosugorodofigagezemi.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/bowikek.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210803_413E3653DD94F9B9.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7654cad08---29252422197.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c933d7b2b---61620355631.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c807e16452---domizomivowal.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca02dca091e---88014248932.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/5593893b82c4cb1f2b462d6fc31b92d4/pipeki.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110dc1cba6f1---16972380402.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/86027832081.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f99944c324a---marididugorupugizuwo.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/5491395bb13e6e9f730a2bafa66322be/26163519376.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/91417528390.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/29314008922.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/purijiku.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/xivanom.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/c3e3ec11f43b079f4521ee0a4f5d2eab/raselofukivamag.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/11980767109.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/fiwutudegitu.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/vopigek.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/84692134530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=peabody%27s+control+of+pipeline+corrosion+pdfPDF 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_off0000d6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EC 18340 bytes
SHA-256: f77b7c69686833f0b1d138b9b26e48e1bc7a2bad89dbc7abeea05c8913e5dddf
font_01_sfnt_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0A 10900 bytes
SHA-256: 394a37bff9074654efcc00e44afad21e8637ac3a89ecdce306c22c0f8ed04fea

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