Malicious PDF — malware analysis report

Static analysis result for SHA-256 2273f0d9a18f9bb5…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 09:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 80d5632ef394c7d93bb76c2bd629f055 SHA-1: d32b8452af004b1aeeb978f895e02ac8695df4f1 SHA-256: 2273f0d9a18f9bb528dd14729827947eadb33674779a62ec0ceb8d411b57fd1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links, often with UTM parameters, to direct users to potentially harmful content. The presence of these links suggests the primary goal is to redirect users to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://medvor.ru/uplcv?utm_term=download+hopeless+land+in+play+store PDF link annotation
    • http://susasoft.com/upload/userfiles/files/vunorofuwuvanazonuwutevax.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/90430441363.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/5aho746hkv8is366gh4o5kgcfk/33301172217.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/lanab.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/7328209652.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/80488479803.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614272b52827e---33106354308.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/78663611776.pdfIn PDF document text
    • http://kalikraft.com/images/file/kesoz.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/malebegujikimukisubolamo.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/42863323269.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/90746316629.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/gelevokusitubodebotep.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/vudufasokegufodewedutewo.pdfIn PDF document text
    • https://rcot.org/userfiles/file/44454055611.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/91678429022.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/jidavaledoku.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/92296342187.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614120dd42740---83210672822.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-05-02-55-28-61.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/vaxefede.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9c267236f---23089896652.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_off0000c8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 16412 bytes
SHA-256: d6267eb10de1ff65ebeb87fa4bc3cd892096475417877e525655319bb59d5ed9
font_02_sfnt_off00010acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACB 10688 bytes
SHA-256: d86f17c64c129f95fc715d656eb1e50e582a2d262ec7b1f572738bb0fc289ee3