Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4f6088b1b1c83a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 16:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2b42373d58b13be2d93208d4cd3c12e6 SHA-1: 5ff5ec662fca236acf025ac71711a8ac5b8402eb SHA-256: 3b4f6088b1b1c83a5c1783a7ead1862055df0fd964ce4b217ad136c7c0014d6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent, likely to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=pgcps+calendar+2019+pdf PDF link annotation
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d21693c31a---18645570121.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/demafajixix.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/71bc0bf52ed14e798ca439311120be6d/55685849924.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/59065303773.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/587936d3516c9a91be19eb354cdec0bf/wevonoli.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/52514633724.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16098920f76b82---savidefutemirarozev.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/lizoremitasaseroremep.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079c5a5dceb0---nopakezivovas.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/49445325775.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/3385515390.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/sewagefobabapabofivu.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77654f3d77---27474712017.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/33676116496.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/tukada.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b6d62deb8dcc290b09f2f73732eb1bd2/7242475800.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2d1b6fd4744aebc80500f9ea8fecb539/gavedotumimefopijad.pdfIn PDF document text
    • https://yuktogel.com/contents/files/geboripoliwobefebe.pdfIn PDF document text
    • http://unityproductions.com/upload/files/tekunafizedajudoxufabopa.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a02b8e2299---6398645053.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/13544308853.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/21587756942.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/dexokona.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_off0000e4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F8 10948 bytes
SHA-256: 1555e92af8b857cee5095ff72e119edb7a31d3facab6f8a60a61e5ff090d0e8b
font_01_sfnt_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 17428 bytes
SHA-256: d16834bdeb1dc9562d813fda4a29841496d01ddda79fa6de9487d2981a3c8d41
font_02_sfnt_off00012b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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