Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29623a08405d41b…

MALICIOUS

PDF

73.5 KB Created: 2021-09-05 23:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23524982c036d10cde964d4c12676301 SHA-1: 95e049c81a663fa271c1f7a2f29ccfe3607f08c0 SHA-256: f29623a08405d41bf25349ae741f8ee348f560b052b5bdb95c0b9c861a6fc5fe
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user consumption but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.amanuttarakhand.org/ckfinder/userfiles/files/73590911581.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/db5cf6c97c72f2aeb61f0aa1dbb04b2f/tumowekivawuji.pdfIn PDF document text
    • http://gnox.vn/upload/files/53919486631.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a14ca528657---36412831898.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/85239937774.pdfIn PDF document text
    • https://masukpt1.com/contents//files/xexugufol.pdfIn PDF document text
    • http://meskerjager.nl/media/files/vaxipiz.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cf3be03e75---16288176799.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5e84562f993ac280c5e2fc684910deed/63715589605.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a800d31281a---21805355445.pdfIn PDF document text
    • http://lcxcable.com/fckeditor/file/fibovizugo.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/3349fe2796210893b07cbea580ba9f16/35242966453.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c8a1d5b55---vafebu.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f445998b9b97874d0b6fb71de94fdbae/4528004682.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/fhnqjr92d90uunpg9nlddlvcp7/mesinumamigux.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb202d6beec---7404645591.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/69879540690.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/55121506525.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/59140077816.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/66705180644.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/9f69c03876e3cd9fd5be32b329e522a9/lipiwasovilorilelis.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/vugamifibukes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=sachs+dolmar+chainsaw+manualPDF link annotation
    • 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_off0000bdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D5 10668 bytes
SHA-256: 94e34454b4be61f4bec5c3e085d019f91b841e1dcf0d4f44694c4daeaf125f49
font_02_sfnt_off0000ee09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 16560 bytes
SHA-256: 0e71ecaf3d5a2e5505cd71c3365e30aaec00037fa58b672494d220ebaed56f64

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