Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7391cc3e136a191…

MALICIOUS

PDF

72.5 KB Created: 2021-09-02 19:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 01e3ee7caa2596ea7502357e6fd53f63 SHA-1: feff379fa1359f4b1e1948db429afab7f37edd6b SHA-256: b7391cc3e136a191e66a0d46ae8420af683bdcdccf94ba73a9c6a988931ad151
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The primary attack pattern involves luring users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://kodcomputers.ro/2664/uploads/ratuzulejobidoj.pdf In PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/30231294901.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/46290923558.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a308ff6a6e7---90068878154.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/eaa43f9d08a5e30ae81a230e7c20ef9a/28435866966.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/89633837881.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/324a40e811fa20de36620561046f846a/4638681675.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/vozutupezobanalowur.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/28937127334.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0683a7bf09---26869721771.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2d6cd119d5855ae902a370d0dc6610da/4497538785.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9da2ac3c61---75691813928.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/fotamafuvipu.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/zamis.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/tetonivijonitugedimuwoj.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/dutufapelasoxuvojiboxur.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/pomewisubedepaf.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16096b8917247f---lasiboduwovod.pdfIn PDF document text
    • http://armanetti.com/images/zifigawofonanijawok.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/kuganelelar.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/37460816518.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/kgoa4d3o0nu5rjbkrttd6mf2o6/kegujigip.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/82327e9e35e826b57c349a0c4cdbddbb/xuvafutopewaji.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/60087160830.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710ab743e98---63628374542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=maths+puzzles+with+answers+for+class+4+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_off0000baf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF6 11032 bytes
SHA-256: 21c606528e06ac989e90156376abf8707a2fbcbca4101a4d34ef0c6a22ea148a
font_01_sfnt_off0000d4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BD 15436 bytes
SHA-256: a1d3a54c295e42a3b5364e55db0251ed3b86e12652ba63be3f921c9aa0442b2b
font_02_sfnt_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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