Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8746c34534a34c2…

MALICIOUS

PDF

89.5 KB Created: 2021-08-13 04:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3536a96005f9540570c97f573963594b SHA-1: 4d55ae5bab58cea746bd80fe3984e64b62eef987 SHA-256: b8746c34534a34c2bf16c5999470411b46b6e82ccc2761288e4bd0af8d3b122d
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The PDF contains numerous external links, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=how+to+contour+a+round+face+black+girl PDF link annotation
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a78263cda77---tobozan.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756a277fdca---2068639723.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/21422906813.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/60133489158.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210623_F446A4E1E998EF2C.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/koreluteguretoli.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/29k34m1t5c9lmr8ctijqm3o7un/20415559766.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/vuponi.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/varuk.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/22259143263.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/62694002675.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qrtv8vu4mgh5mfevqlt9dkc46m/zakakorogigenanasofofiw.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/96528725387.pdfIn PDF document text
    • http://splogservice.ru/content/file/midegagejulag.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/wexuxinapiwigam.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/23873169557.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/jisiwedi.pdfIn PDF document text
    • http://ecole.ru/text/images/file/5617644862.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/karana.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/640842769.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16080e189975f1---kuwugukovizafodukogipefa.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/97786676089.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ad11145a2ab2944282beda98f49995fb/48217090069.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_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 10892 bytes
SHA-256: 6684972a6f376e6ad7988c71ccf089a7c68338767defcd98f2a939639e6b93b7
font_02_sfnt_off000123cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CC 19516 bytes
SHA-256: 90eb1eb8c50e677730bafa34a8a689a6380da479928621e20383699ffeee98c6

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