Malicious PDF — malware analysis report

Static analysis result for SHA-256 821b8692d802b3fb…

MALICIOUS

PDF

89.4 KB Created: 2021-09-11 08:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3ea54e96fc2bb086a4ee88dd63fe65b8 SHA-1: f430814a3620187f4284620218da04e0e0d9d071 SHA-256: 821b8692d802b3fb23f400a5d756ef9cdf4f32f95b51bbdbd36dad10842791d3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The document contains a link farm pointing to various domains, some of which appear to be compromised WordPress uploads. The presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to malicious content or phishing sites. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=mortal+kombat+vs+dc+universe+android+apk PDF link annotation
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86126108392.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a55b8b8cb---nipowikuba.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/vijasoxumum.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/56552907047.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/xatofesesokagamuvikizu.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/fefivezokoxovewozeli.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/5670614986.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/fegovikiginuzuk.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130ec874e444---48998182216.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/72359192505.pdfIn PDF document text
    • http://special-pharma.com/upload/files/30594170921.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/67011216547.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ca34cfb25---kejokot.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132874930c2b---vumirumu.pdfIn PDF document text
    • http://chenruichem.com/upload/files/gevixopeso.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/27076971563.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210910030547.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/54571116318.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210911131321.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/jumedelutisirugi.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/20667648801.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/gabuvuzimugomuzafuke.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/wimokidatig.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/fezosakunireris.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_off0000f670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF670 18244 bytes
SHA-256: 8c6a6442688033e4bb870651bebba8180542ab73ea927d0be456030154507759
font_01_sfnt_off000125dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF4 11068 bytes
SHA-256: 98b99c67f1dd46041d0ce0b859f62eba7d03a5984b2cf6a55d8870d66f9922bb

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