Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ed36210b63c3d3…

MALICIOUS

PDF

120.0 KB Created: 2021-09-16 08:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0903e6f82535d1a323b47e63f1bfd72e SHA-1: 3a088d052438ccb377cc6a84ab97db67bf18fee6 SHA-256: 53ed36210b63c3d3570f69986bda2f9d9fa446ace68004741a7b920631bb7e14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external URIs, many of which point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=smallest+unit+of+data+that+can+be+stored PDF link annotation
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161409c075b67e---6941703233.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/ledixatowafajisu.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/zilimopividojapujolil.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/73228140385.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/88360825129.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9aab2d60f853a727996b8184c1234e51/52857696111.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/042025be6aa1dfe3be6ab79ff75358d2/xefodejewivefozidafopu.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/pawebovonoferuperajogoto.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161410ab7977d6---kabebabegumetelawa.pdfIn PDF document text
    • http://scro.ru/pic/file/sedasuxile.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/33072973711.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/93775895169.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/gunuroxufumitaxagegozulud.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/60963558416.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/98888607802.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/c3abb9936edc313699994f1347ae479c/45289436870.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/13168021849.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/ludobariwoware.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210915_201153.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/37279781247.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/81761541472.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/begomagowozulabupawaxuvur.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/58838744103.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/18275634177.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f1a7da73---ziwalexexanelajaxil.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_off00016d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D0F 11056 bytes
SHA-256: 0e88b3cdfc830e57dc306d258971f90463a37f9268d276b9ca5eb7bd987fb321
font_01_sfnt_off0001868d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1868D 19708 bytes
SHA-256: d5af33a9217133c72bbe4f31340c99ade4c79f88b2640aa3502faf38c53fab28
font_02_sfnt_off0001ba1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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