Malicious PDF — malware analysis report

Static analysis result for SHA-256 b176e5392d7216e0…

MALICIOUS

PDF

88.1 KB Created: 2021-07-08 08:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8de326a17e44ad2b4285c30c3504c73b SHA-1: 5bdfcc874068899e0716acdd179dceb95f22dfab SHA-256: b176e5392d7216e0243ea312bdf4673491a9b3e267c8022fced554c7c806166a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing sites. The presence of multiple external URIs and a link farm heuristic further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/f303d89a4d61ef4c021bf6b76ff37595/fawatob.pdf In PDF document text
    • https://dancleland.com/img/upload/file/3284799918.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096e1c4e9b68---mamod.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/a64f03992fb89743aedd967b1a4e8c3e/35412034636.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/risiwuloparavaluto.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16095ad7cbd3d6---83761222232.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dae667755---86045952390.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/4feac91f4125430d4f18186b0b0039f0/faxefagebawuzelema.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/rebusodibixilodano.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/4de4426f4409ed83604d6d35f234fc33/rusuketanijobufabizovud.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/85dd807ab0c7cb4c69dde72352f4abb6/57368996448.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af118cd167---71709365584.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/vaxopovunabudid.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed43a58148---81141495267.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607503dfb46a9---95555063996.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ee3d87c09---sojima.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/9067878583.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46d992d68c---lotunim.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e669bee4664---midevafuratomamuliguxorix.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/48216927309.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/78123106265.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/89047132106.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863f330b774---zodaxirimo.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/86487768890.pdfIn PDF document text
    • http://fsanaq.com/upload/file/2106291015284218774ejdy5wh4tfx.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=one+last+time+adelePDF 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_off0000f603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 17212 bytes
SHA-256: cae1a2383acfc7c1fb35b4d368c6ac32bb9136c26c64780ed45a105f224ae38d
font_02_sfnt_off00013adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADF 10216 bytes
SHA-256: ae1f55e219f380e5e12cbbb907fe19fb6cdbf3b204030f18e32df299caa69cd4

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