Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3ca86fbec6c0b8…

MALICIOUS

PDF

99.4 KB Created: 2021-07-29 23:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5adaaaa4fbbfe6b0b5c2e34ee93bbf2f SHA-1: 75452e0b55e5a75d91c2e21a04fec68d3c2fd633 SHA-256: 5c3ca86fbec6c0b8e907ab19721bed695abe63749289455d53ab473da4f312a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to compromised websites, including a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The file's structure and embedded URLs indicate it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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=figurative+language+in+the+crucible+act+4 PDF link annotation
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/29f7bc0665cb70bb24745e5b3098cc79/99462060979.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/fuwozak.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/8222fda1dda8646493988f18c1be453e/dukubu.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/zazejil.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/57499525220.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5945d36420---wifametutatofez.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/tfa7ti373mbn221io32ls7o4f1/41981228146.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4f8c2818b---vabokolemofozuridoba.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/lukigemekasizigufafit.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075db279820f---7350628547.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/m9u34lu5sisum9au873srluq9l/3153967472.pdfIn PDF document text
    • https://ancoraeducacion.com/images/rotibodajosagewowegav.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/pokafadixojo.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/gufidojiwexajotixukewewaf.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/70134310779.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/xegifinibolesitax.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/0p32kfpc877lbv263vmtnd58dv/63129291365.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/50755283520.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/33162502090.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/pj15gadv25apddg46c1ajcs440/tituranapazelobamapiduso.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160aed577dd13a---gadus.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/poxiwolatigoporatobol.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0ae6dcf1---96454808169.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/14746729432.pdfIn PDF document text
    • https://reniuved.it/file/sozovopaxudalinuzize.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/fb7b85b59579d50c793a4ebaae477dae/26813623009.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_off000121b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B3 10580 bytes
SHA-256: b7b4cfedc840f82b9d0b38efda5fae168d5d05fdf65af4e70db08dea121af6cd
font_01_sfnt_off000139cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151DF 17348 bytes
SHA-256: 93dc3c9ef85af3cd135333143210ed35b16ff733e93437a0d117e9777fef689e

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