Malicious PDF — malware analysis report

Static analysis result for SHA-256 634b8effded3df63…

MALICIOUS

PDF

94.4 KB Created: 2021-09-06 11:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c64bfb5c816f22d413f1a0c79f8897a0 SHA-1: 477de4d83ffe52d313b74bcfd1d063af1dec3e95 SHA-256: 634b8effded3df63cc0b915a55498e69289def2c9a0d37b844100b0ae53a0f91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://garglob.ru/uplcv?utm_term=colours+vocabulary+worksheets+for+kindergarten PDF link annotation
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad417c7347---28606302764.pdfIn PDF document text
    • https://aneri12.cz/res/file/27035099985.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/seaf7ph37e8mlb3fqbbuvkv1o5/tirusiretubolu.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0fe2924a8ff6858e38cb564bfaee502a/zanenuvul.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b0359e480---28552568956.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ce903dd71---migifekomekonevotug.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/fozovudezabinodusinabupes.pdfIn PDF document text
    • https://energooptima.hu/upload/File/nebizazofutukemuxuretu.pdfIn PDF document text
    • http://kkitv.com/images/upload/File/34787671708.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160944c82207a5---petusiluxonaziruwufi.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/30p7vt4sdiaberlqudpssa0l1i/bululufozujas.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/9odg47r23e7m2d7jae228kepsn/paravurafisanadugokoj.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/9dc8630b5c0ff0a835c5a6550e3dcf4a/sarajari.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098894f98c12---getomofala.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/fudil.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/jobabuniselevururigesewi.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/17982030223.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ou2q0kkfdbkchm9pe9o0laq41i/26821383210.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/zegodapepakafi.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfadca8ac6---75859742008.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae3b58c5bf---94631421223.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/89338030248.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/tedafuliriwijulozalakepo.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e72ffa0f329---47769336757.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_off00010524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10524 20028 bytes
SHA-256: 2afb566dbb3084d14a5762db13b393a0d72b1968f5f81adc9fb3ef4bc3acc965
font_01_sfnt_off00013835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13835 11384 bytes
SHA-256: 436641e19fe9efdb5afc31b336dd93736ebd469c68aad16a98c6aab74c2de657
font_02_sfnt_off000152ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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