Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb77f1bee1a2969…

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 16:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 34d136a58bbce27b090ed87b790d8133 SHA-1: c99d5e8115d8c868052cba62e353432928f11dcb SHA-256: bbb77f1bee1a2969e8eb04ef77a20bae228fef10013d049404441343c51bd2fa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains a large number of external URIs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the presence of numerous URLs indicates an attempt to lead the user to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://irlanc.ru/uplcv?utm_term=2015+chevy+spark+ls+manual PDF link annotation
    • http://aven.su/userfiles/file/joluw.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/pnac7hl3mnc56es27mljj82c1h/70342960459.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/jibosetuzibor.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/fijufasejelop.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bb93ec14a---jinuxolijovaf.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b387344d5051437c9dc29c1b27a3409a/84202187865.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/rubekukosotaligoxirozuja.pdfPDF link annotation
    • http://jmk.kr/ckfinder/userfiles/files/34276836354.pdfIn PDF document text
    • https://whitesal.com/data/images/file/6826_20210614084708.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/63963445921.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0751893d92e41ee3eb1c978e2f78533/26041021670.pdfIn PDF document text
    • http://scantech3d.com/files/49694391879.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf6aa3324---geluzovutususore.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/42317397484.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/danifalusabu.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/43242314962.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/kosamexiso.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ac543e3a1---75586954884.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/3610985705.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ee1b41c0df2fe69d1900566f116e7301/fonogugisutabebafebemo.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/wimetataw.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/xamibunidon.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/2vve4dma3esngk3v3k0l1egb83/82195077009.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/75881971116.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/43580973201.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_off0000e2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 18844 bytes
SHA-256: c6174aa8cf16d23dc1004c6131377cfbe8cc27dcb8318fda1d8b1c0d467f7ccd
font_01_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 11032 bytes
SHA-256: 3b53d88c50d32a7950f85b047aae86f29474336738b757288c885cc63bdfc0da
font_02_sfnt_off00012dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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