Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4110453192d936f…

MALICIOUS

PDF

73.7 KB Created: 2021-07-06 12:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5862513722bf525c3560de185264cb51 SHA-1: 54b6d76daf6a48f163e1484b0184870c2200c6e7 SHA-256: c4110453192d936f630df7008eb0f3de549ccddd0522e2d3ccfcc234cbd7bd3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The primary intent appears to be directing users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://coretry.ru/uplcv?utm_term=dcast+in+r PDF link annotation
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/f6v7lgshcn71dl8q0rgpcdv628/teturifosigatoxovag.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/medepurawuvazugebesolirix.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/xedovuxatewimix.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/55737738270.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609845c3d1177---fonipu.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083d6aa6c4fb---masok.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/4aa51d71cd32e35cbf6a8b484812ba04/lisanure.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/73963697643.pdfIn PDF document text
    • https://people11people.com/uploads/File/83429805125.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/p0lk1bh4uksbi6ovfgg3qe081f/sototowijuzox.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/870e1fd81ed0628ed7cabcf1e0466678/begudikimejotuk.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704839de31f---57248384510.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a205ab42a9b---visorejefi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32597758a---28064012866.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/nuturesetexo.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a29c98398---92254855365.pdfIn PDF document text
    • http://intergeored.com/upload/File/ganorepakalarotira.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/dtcbshhn8mjili3tg6kpklhnq1/wunanawolirabuzovejeb.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a249c348b31aed021f1a2ed27df1fea3/62302222649.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc8d8e2879---webigibopudof.pdfIn PDF document text
    • https://mauspro.net/upload/files/rorimuxowuzokutub.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e3fbd49ec---gafuxarik.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_off0000c1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A0 15924 bytes
SHA-256: 60cca999bc40bbfb9587e255e0b36f1aa23334aa7622318e8ea55edc32b5fc2b
font_01_sfnt_off0000eadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 9928 bytes
SHA-256: d233bb1ddc889346df1d57d934f147f694723b493c0d343ca5e2b4847da31f76
font_02_sfnt_off000100f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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