Malicious PDF — malware analysis report

Static analysis result for SHA-256 29845f61fdbc4240…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 07:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 530732f0efea31d6f74e3c86f3232870 SHA-1: bd3fb7712e15022ad4c1a30604f331d7776ecc4a SHA-256: 29845f61fdbc4240bcc7d9bb0deea8a85b3738c4a7b60ed52afd60b397a6d510
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 hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of 'utm_term' in URLs indicate attempts to manipulate search results or track user clicks. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=es+file+explorer+themes PDF link annotation
    • http://studiosiciliani.eu/userfiles/files/tojevuvitixabararazozog.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f998c15b66---madoru.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/ziwibitejat.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/bajawezo.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/214621427.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/giresuxewewunokosewumawo.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/31572874759.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/40905827611.pdfIn PDF document text
    • https://matrixx.lu/images/13177175659.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/11268321079.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/17809299172.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/fopikanejigidikegu.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/potonufalamor.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/22954950053.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/slhgaj27813c86539hureegpr2/jajetomoxese.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614121febb86b---lisene.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/23726037006.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/62046802919.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e52690ac7---botorinopimovimebofuruzu.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/51718786515.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/fefaderoleras.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/9202585406.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/18557180708.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_off0000d49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAD 20888 bytes
SHA-256: bdfc834b410be2cfeca70e40c5c7754468e0da820ffabcaa29ddbe2ff3fadcd8
font_02_sfnt_off00012386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12386 10440 bytes
SHA-256: 1acae1a88f9a16151f334584e8dbf6e8c1cad7745d68dde44c989072fb810812

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