Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e338223be9e4f6…

MALICIOUS

PDF

74.3 KB Created: 2021-09-08 10:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ef0c4bb1e64d7e983b3474aadff58d04 SHA-1: 0368a2378758cea3942ae4b9d3707dc1adc29b17 SHA-256: 10e338223be9e4f6c107d70fc811a4bdf2f75f04de0f3ed2ff86ccda7bdcb9b8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely intended to lure users into downloading further malware or engaging in phishing activities. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=english+verbs+list+with+telugu+meaning+pdf+free+download PDF link annotation
    • http://e-kva.ru/admin/ckfinder/userfiles/files/rewije.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/923ef8912c1f9524cdf172ed37d31d05/88874879097.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160933f433e136---30193070782.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1d6a036ca---juvusurodurosiliz.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/dajuwepeb.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/18663f08b8096085814d5848208a9653/89997635325.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/48957218125.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/suminumap.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/61652179940.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/nisunudizuda.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/3f3d7863ae5f50a38de6e4bb5a5ac4fa/59046009829.pdfIn PDF document text
    • http://fedime.org/imagenes/57678917721.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7909aca46c---vuwidakuvozomaxuvevinux.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a65f1534a7a---84370110875.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d47d2b8bf3---lokigevozitejegusagedum.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134eb3b0ba83---84544169082.pdfIn PDF document text
    • http://greenld.com/userfiles/96867951952.pdfIn PDF document text
    • http://emeat.ru/var/files/fekexasumosozusakejajodu.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/5181c5178905bf3e2f53debe98b13ebf/vagagaropu.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/tipuja.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160875bcab3ff7---jubebegezijoraf.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725bb39e115---40085532825.pdfIn PDF document text
    • http://jarosi.hu/files/file/lowurofunidulobuzajumim.pdfIn PDF document text
    • http://agro-partner.com/Image/files/devudotureriviguzo.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_off0000ba17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22E 11320 bytes
SHA-256: 3d4be353937caa04731dae9d27db29bd5dc05e190957be63c833dbda0d9933ff
font_02_sfnt_off0000ec35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 17860 bytes
SHA-256: f7f5c5bf12ed3d09b4e464c4c6130b0c98e93ffc41544783ed6937daa3ca3f60

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