Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7b0da44f38b9d2…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 23:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 31052b28a5f354532b02ff5242a2ba8a SHA-1: fbde572592d0e6ccbd2852eadcfa3e2ce5b96d4c SHA-256: 8d7b0da44f38b9d204cb5787e7fb9bf6694c91012c6b021d398d92e12722f8a2
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates social engineering tactics, instructing users to run commands, which is a common method for executing downloaded payloads. The embedded URLs and link farms suggest the document is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://synerhu.ru/uplcv?utm_term=turn+on+light+mode+chrome PDF link annotation
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/rupugenega.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/53312254341.pdfIn PDF document text
    • http://www.moyekolodin.com/files/62338778168.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/89696146700.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/cadac47d130b87e1c7a5b53de822fdb5/29674498431.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cef5412007---43105733287.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/96442126262.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/10995629863.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/xajadagatixumewadeven.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/pupekolar.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/wuradatul.pdfIn PDF document text
    • https://profm.hu/files/file/13688081621.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/kawavupebukowizumiludekon.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132cb65194d9---63986507913.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210903131326.pdfIn PDF document text
    • http://juha.be/_files/file/69697270592.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/ditoxekubasap.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/jaletosajone.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210902012703.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/94063951159.pdfIn PDF document text
    • https://armenia4d.com/contents/files/fojokipak.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/fugejawesatetujig.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/nukimok.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/12805162046.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/sumaram.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/4505550696.pdfIn PDF document text
    • http://teakdeck.pl/files/file/dobawukagi.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_off0000daf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF5 17572 bytes
SHA-256: a5d5a5e7fbaf6b7c79da87585029cf29e540b77053e152b04c1ddb1e7618d1dc
font_01_sfnt_off000108a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BB 10552 bytes
SHA-256: 86c657ed3dee757f51d266b27bc330c53412cf4f5baa875c6d5311f3b63fb97b

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