Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6cb3c3800d12f2…

MALICIOUS

PDF

83.9 KB Created: 2021-09-08 02:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aef9ab27992533e06e126529e1899882 SHA-1: f82b9b85cf50f5004ed9f20045e7798446d2fe84 SHA-256: 7f6cb3c3800d12f248bcbab9d53db1977c8031e6ac19860215535875d11c72bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV detection. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI indicators and link farm patterns strongly implies a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://krisoc.ru/uplcv?utm_term=midland+weather+radio+er210+manual PDF link annotation
    • http://capitolmetrophysicaltherapy.com/userfiles/file/jibolirezevuzabexewotike.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/jimovusazel.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/98392349942.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/rejaxek.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/62188531588.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jdn7sbmtagrbq8nn8j0qr5qkr7/xilejamifededudurofenena.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/92360737506.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aecb482ac---pebaleloziwapazonitadaxeb.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/63270321424.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/kudumakikajalorutirix.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/9d0f660e67ac48f08b222aeaf94ff9cc/25677510735.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/61ae4d18e49f360b582f1ce1f55cd4e9/ririmaxodatujefavuru.pdfIn PDF document text
    • http://mobitransjogja.com/files/751437142.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe7064d471---buxuxumivoji.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130baed949d1---faxinovodoremurunexi.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/lilopikexuzi.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b08f2c94a---40104413672.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608599f476b8c---vuvala.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e9565eebb29775ff3e6d5b6a0a4c0fdb/93141166751.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/7868403652.pdfIn PDF document text
    • http://aps-mes.com/files/file/tosapexawuvito.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/51421112894.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/gogirozugedal.pdfIn PDF document text
    • http://deckdreams.com/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/99056483892.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd644cd164---83079856897.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec106b6206---katavotim.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_off0000e25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 10816 bytes
SHA-256: cf043ad9073cc82b530eeaab562aa824443064e4028221163c8cfd369ae5bc30
font_02_sfnt_off00011344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11344 17888 bytes
SHA-256: fcbc72b1801a52b9b3776c6e705c15c835063ee54257a09abcd674f7623d6bdc