Malicious PDF — malware analysis report

Static analysis result for SHA-256 9beb1c7efe09c396…

MALICIOUS

PDF

80.4 KB Created: 2021-08-06 01:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 37ec1a5176ef4fd3962cef6a4e86985e SHA-1: ef1409eb1aae751f9f788f6f40fd5bd7fd62f598 SHA-256: 9beb1c7efe09c3968268da171953a9c3a92deca29acf883edb5e311792cab780
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, presenting numerous URLs that likely lead to further malicious content or phishing attempts, disguised as legitimate downloads. The presence of multiple compromised CMS upload links and disposable hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://coretry.ru/uplcv?utm_term=learners+license+test+questions+and+answers+pdf+in+hindi PDF link annotation
    • http://energy-labels.com/userfiles/file/xogofuxebejakesanetab.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/bawegopivuziv.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4593d07d35---wirusa.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099b788e0855---vigobiru.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977f6f6cf97---39093775587.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/63505809245.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608078de85b4f---48430487603.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/5e86bb040d5b84e7b9f9181cf8b58bdf/94299697340.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/7cbd4fbe7691ba375281ae347ecd7f05/9188162786.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160799a8c0d89c---mafuxokegiviban.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/56476735054.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57a9cd08c2---tizan.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/96648063215.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/23395847987.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/60860585351.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/wibofovaguted.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f9983a2d4d5---14104903629.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/38153941181.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/gukefewipuwudaja.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/f28a559ccd6d363f56710b4f66bbac00/76564126294.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1199a06524---nixanejerubozudawovolo.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c0268aaeb16---71092044302.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_off0000d50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1E 16472 bytes
SHA-256: 79de7308925bbc96e5a789a475e15263ff5a951fc518cfd696068f7a07b59ae1
font_02_sfnt_off0001174f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174F 11008 bytes
SHA-256: 50eecceee616ea73be711d50221ab39026344c8cfc0aa647b51c074b6bdafe0d

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