Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b869b34f60c875…

MALICIOUS

PDF

82.8 KB Created: 2021-10-06 11:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 8af49c532b3cf8b6f008c1d67ef318cc SHA-1: 855f6ff9a023ed5095304f301583ca0a85ae4f45 SHA-256: c4b869b34f60c8752aed036f211ad516fe67553c7f70c414a66b1fc89d444feb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic firings indicate a phishing or malware distribution attempt through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=what+can+you+feed+worms PDF link annotation
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614c323bcfee5---37229086590.pdfIn PDF document text
    • https://hum639hb2-hh38.com/contents/files/35768572605.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/wufenezuzasaxibuvowuti.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/dolapiveduxenevezogugul.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/kuzarubuzubonepovene.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1e54baf89---niriminamonabunelewarum.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/72943850651.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/335653763.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/49235510765.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/noxupuzoguzibawuriruke.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155e9463993d---wevibi.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/61437818445.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16155f5a48310a---tiketosowovosalewevaratuk.pdfIn PDF document text
    • http://newcityhk.com/userfiles/96307938871.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/90241226229.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/nejisepibodugiminuwewisuj.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/ziwakuzajisexo.pdfIn PDF document text
    • https://sergiomauri.com/images/file/xazarejozogobigit.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/pegezoxukatixuwamovu.pdfIn PDF document text
    • http://paliukenas.lt/i/File/mewugevomikopebizi.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/89879366855.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/punasoxijetabalesadenemev.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/jemakedowonupaj.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/46261501384.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021100317434337097.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_off0000db02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB02 19192 bytes
SHA-256: 9ab4ca8f55a84f381fde369e905c64d21574db510e16558683738982f8dfcb78
font_01_sfnt_off00010cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD6 10896 bytes
SHA-256: 5744e8bc94342ec52795566957b80de3629136f5c276b4ef940749a21a3273d6
font_02_sfnt_off00012604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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