Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5577c76d710a9c…

MALICIOUS

PDF

94.6 KB Created: 2021-07-09 05:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2fe19e978f6ce24676b909263d419e0c SHA-1: a8511444013e3aaa8c0c86024e284437f6a23999 SHA-256: 8e5577c76d710a9c0b06b1ba17f4273fcf3276060c05dc1a1f75703d3ea842e2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the non-clustered nature of these links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://wastran.ru/uplcv?utm_term=the+field+of+biology PDF link annotation
    • http://playeasypiano.com/resources/fck_images/giruve.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/janamotamutejalibujodo.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072030ae298f---72471919782.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/3d8698e7f16a9d2d491f79a0b4d4bcac/69132613217.pdfIn PDF document text
    • https://harvestrain.com/wp-content/plugins/super-forms/uploads/php/files/35db359269b6ec0061f527faf12c7650/37312744013.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c94cf9911b5---39784791707.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/pisozuzogivededugim.pdfIn PDF document text
    • http://atya.eu/files/file/1114792107.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/44581559767.pdfIn PDF document text
    • https://htchninc.com/d/files/derekagej.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/42790930903.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/bikiwaluzeposapagokoja.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb0d33cc68---giduzefazokarotupiduvi.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/18717688574.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/489d4c90763d92c2e8427db7d2ed1b4c/kisevedowuvox.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f4877c67c5245dc6da6e2de7d781c7ef/70664393298.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/91306130131.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac106425ed---81270907566.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/tm2077rs2p8t23sqh8p5jmviu2/3841681696.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/duxiraruj.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cff10727591---wadokulikemetokono.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/13993062150.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/mamula.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d4d1b977010c2180d529c5b8715a3769/56134217390.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_off000112b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC8 16720 bytes
SHA-256: 806405bc682106910d015368385d23cc3969c90cab0fc729462da2b8421f6cbe
font_02_sfnt_off00015662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15662 10216 bytes
SHA-256: 6cd34bd83d5373fd30de46ee1111bc82a774dd6260c8025607559cc4843ca4ff

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