Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b31b8c85c44200b…

MALICIOUS

PDF

93.7 KB Created: 2021-07-31 10:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c3f93f2c335f99d34119724d0c02f163 SHA-1: 980e69de7d93965c7384999ead02096b46d8f574 SHA-256: 9b31b8c85c44200b0aa3c6cfd3d316195e56890d13f824ff645cd2bd79e3ea5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://drafthe.ru/uplcv?utm_term=corrig%C3%A9+livre+physique+chimie+terminale+s+hachette+2012+pdf PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/u9k9jh278vbgn96t0mlt68h3lu/97297865951.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/mudapugabisujotejerum.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/df03bfcc2a617c97e13adb8796ddeed8/wedogaren.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/pefisaput.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/82188599618.pdfIn PDF document text
    • https://isleo.com/i_photos/file/32288658716.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/2368809860.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/pidatotajasezexozegun.pdfIn PDF document text
    • https://soft-print.pl/app/webroot/media/files/dumoxawemikozituzom.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/walupisedarubitupabalefu.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/fazobijobimagomuf.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160778fdd8921e---41506762007.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/23625471929.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a179150bb701bdf7b398c1fececd04cd/dokogamaz.pdfIn PDF document text
    • http://orem.mn/uploads/files/18244849111.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/70167246640.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/runezos.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/puwuser.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4e349e39e473161aa16fdcbf44d70aa3/24284005941.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/vh51oc5rr4c144hietep5iigma/42410296668.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/24388349565.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607084280542f---zifabavofazaxikevela.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/3714986795.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_off0000fb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 21044 bytes
SHA-256: 9fc81aa21f3d1d67fbeb7156e51b77099b5d21b80df799f89f5a447fc1e668ed
font_01_sfnt_off00013186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13186 11972 bytes
SHA-256: 3ec047c190c5cfd2218c7cc099f6542152a57070b43f52b89640d6b2574f0f6c
font_02_sfnt_off00014d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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