Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b98d7deb13fbbca…

MALICIOUS

PDF

86.4 KB Created: 2021-07-14 02:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f2c2dcc0b68cebe7371d075d51127823 SHA-1: b66c38a881022fa9aa3e70e670ac26f47738b7e6 SHA-256: 9b98d7deb13fbbcaf7831cf1a6b6e4dabfd57c5d784d4ed26864432eaeb90288
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://studioarclab.eu/userfiles/files/97000143845.pdf In PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921dd15aece---31705684369.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/70475597775.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/2bb6a2a2fee5d6f44d6606a18fefbff8/74768496725.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/94083893613.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/mapobokarejufij.pdfIn PDF document text
    • https://premiumtrade.ro/ckfinder/userfiles/files/28756309345.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/tolovawupeposun.pdfIn PDF document text
    • http://dgjst.com/upfile/file/durarifazafutanijasoluj.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/delonireg.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a854dfaf6ef---20226547370.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607817925f03d---41866727033.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/65291896812.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/93793556869.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b3c8906c1f7---somasijanufoxutilurifeji.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/35713359358.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/govilinudofosimigukosus.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/76707984694.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/62393437157.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/46265389864.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/06034624033dc32e90872a849c3b7ed3/78772458259.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c710ec93d62---84273750535.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d10b85ea8---zalutojunazaw.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/78633022515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=things+to+do+in+malaysiaPDF 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_off0000efe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 17304 bytes
SHA-256: 41a040a5dcba95f09c9ab402236b8d91f098b9070394ca5ec73c1beec0eb4d9f
font_01_sfnt_off00011d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D07 10540 bytes
SHA-256: bac5c1ea7ba2e9c9c30e9c8c039d8393d3529baec08db198359623e8e05af82e
font_02_sfnt_off0001349f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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