Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fe56ee49b79475…

MALICIOUS

PDF

69.7 KB Created: 2021-10-02 21:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 06b01e4c62baa9e2da5034fcb36f405f SHA-1: be6edd5f94502e1b5dd0dfc6ae5f2f01866b2488 SHA-256: f4fe56ee49b7947558b92602bcbfa59db9d63ce30f2f216a1d1d4bd76ea01a76
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate these redirects or further obfuscate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hse.tw/upload/file/67346995301.pdf In PDF document text
    • https://foodbiz.bdata.link/upload/files/komanalibosaporofedij.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/97581425245.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/93429646783.pdfIn PDF document text
    • http://candientushinko.com/images/file/9387504183.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/45014352940.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/guduwoxininel.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16153b69dccfa3---witezatupasugu.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/fukeguxabujugenunu.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/viximikabobakuseroxorav.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/94562642427.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/2c4kpd24vtdbon0gq9a49n8924/vorogimorutigekepigop.pdfIn PDF document text
    • http://xn--80aer5aza.xn--7-4tbj3b.xn--p1ai/ckfinder/userfiles/files/jepatibevenikagep.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/bozosa.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///82364420332.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/95214691199.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/10292758032.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/mf7urmfe9aebobgiddaeqnhff7/27083813992.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/81817617400.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615453297f879---biwirenaja.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/rugidikezolaginevuvafoziw.pdfIn PDF document text
    • http://chargooshads.com/images/upload/files/8050522455.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210912_9A3065B227814741.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf8e1a6327---63069694255.pdfIn PDF document text
    • http://chamdure.com/DATA/files/21145167526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=india+cements+annual+report+2020PDF 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_off0000b15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15A 10968 bytes
SHA-256: 34afc242c00eb2bad5916ac9e14be438c2e2c273dc0b2baaf2f38c1563b9c4d4
font_01_sfnt_off0000cacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 15264 bytes
SHA-256: 778aa8954490f7d8211b2985be75b46a5fa5f786ea006675fe27a88d3cee5401

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