Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a3bbd752d24c3d…

MALICIOUS

PDF

72.7 KB Created: 2021-09-15 10:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 044db8b20e5102c14c35fb913a81a77b SHA-1: 765d709f4f98bbb24854b1257067b63cdecc5c36 SHA-256: c6a3bbd752d24c3daf1655c4b198b6a3e20d8e4853eaeefab5d161e39a1150e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://synerhu.ru/uplcv?utm_term=samurai+jack+for+android PDF link annotation
    • http://labotinnghia.com/img/files/zaduxulimirapulenevon.pdfIn PDF document text
    • http://i-dron.cz/data/file/34390777925.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/gunupusulixenobiw.pdfIn PDF document text
    • https://cubic.is/userfiles/file/44195920722.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8ee37ad03ee4d4511055cb70363161d0/94697895589.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/49875899530.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/34441850465.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4abc21e5a---73238824614.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/dopojivokon.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/wumonavarep.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/sopudujove.pdfIn PDF document text
    • http://tecksco.com/upload/files/29086573924.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/6632644979.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/86930706048.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139ff365b278---xoritupeni.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613682cfce33e---xiwosekasopowuvipudobi.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/83373357184.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/gejuromumalin.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/90984987453.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/3659318606.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/olttjcmi4rcoet5afauaicqs3e/69989703818.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/61296980872.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a8a83103---64896804766.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/99648031245.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/73242052456.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/10672697231.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_off0000bb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB79 10588 bytes
SHA-256: 9a385f8e6a48811df4b5902a85eac07aca8e4abe68f40a33457e03414c8ae454
font_01_sfnt_off0000d38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 16268 bytes
SHA-256: ae87505f9f63b394407ada3b3b7f56cc2a5529f64079cc5efc6ad44ef46cabb5

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