Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1d736304d81329…

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 11:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84bcc940ca7c2381bca48d2b1567096b SHA-1: 1d470a411225e9d4752f902518e2019dbf34d11b SHA-256: 0c1d736304d81329d8a4aa598bc379a8eadd1704e51cc18ec236b64bdd242df4
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to potentially malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://np21bellapalermoshopping.it/file/xuvapuxolokusej.pdf In PDF document text
    • https://bokaichenyu.com/upload/files/40008613373.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079820cb1f39---21815792092.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/piwawipifodisanirozujubes.pdfIn PDF document text
    • https://isosklo.cz/uploads/78963831538.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/74664294873.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/newefiligafivasewi.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f4e70af5211cb5d697f5b0d2831d1a5e/47766647731.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/3fed048bff814f27f7737d8713477e1a/1892687014.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/80581469939.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/joxawupenowidaguzubase.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/c39e3ed92b362eb4628dbc5880c67b84/dotewelepitazaralajewoga.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/19854664217.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/sudigi.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/vekiwekejotuxo.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ebec6ce6d---85305956210.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609deb2bd1563---11795365111.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/stf62i981q6p2qjq5t8mgnm4e5/jotajux.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/80251373691.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/5e3b792f87e66b881e576f057045eed7/24907402455.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/43500441599.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/80518644701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=importance+of+communication+in+customer+service+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_off0000dd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3E 17064 bytes
SHA-256: 09ea9bb77ea28adb5e0887ad637fce3fe0748c6cce4c66e7963c82a2c6d5961e
font_01_sfnt_off00010995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10995 10852 bytes
SHA-256: 570a4457b82d44895a9b8b2e7cca548a2abb074cddcf87b6673d237c3b061f5e
font_02_sfnt_off000122a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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