Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3776688f518088…

MALICIOUS

PDF

83.7 KB Created: 2021-06-30 19:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6b4c208a6b91d9d0ea0a7ab7b7ce40eb SHA-1: 35be8adb4722625c2f86ec091deb1f7cfdc8740f SHA-256: 8a3776688f518088b85f947dbf75fd30aad05246bf9126ec5521bf2f5d244485
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. Heuristics suggest it's a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely exploiting PDF vulnerabilities to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085797a7acb9---gaxemaximijen.pdf In PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/47fcf40bdad631ca93d5251ef39651a0/32944662280.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/535bc9aa8cb2a89e3cb22a0694e2cb7f/bazixebenet.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/negaxojaxuxafolibumagax.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/84664329064.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210615233427.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160863dc078db3---34308869268.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f280fb323b---tewavanuroxumuvexavaxesa.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/b25481c3ccb7a30e54ca0355d3ce6e12/wivaretugexep.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/85901498016.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/37a0164f2d068c7f482f62f4e18fc691/zelusogadavaxelari.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/a50d5d89bb8453e6513de30d33cc9ee2/juzujiwodiwo.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160856ddb4e5f0---gipines.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e8e948d2517b2ee538ad306502147e1d/botefija.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/vuwodoxotigofiwupuvodalit.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/feb461aefb00174c6293d45aa028f9f7/tuzijarugonoloko.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/dc506811a0ddcbf8a46686385fe1397c/fisanovivagija.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e8ce432595e05bc44cde281b1f397885/72435708255.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/tikubob.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/0eudgtjkf1kg8i1ikvo2q5mfgb/74265223304.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/zebakazu.pdfIn PDF document text
    • https://ocbond.org/userfiles/files/wuzubadaxuboxemefabobed.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607263c8deff2---dawinebefezoneko.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e66fdb6f1---21774020502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ownership+of+name+ending+in+sPDF link annotation
    • 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_off0000e4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CF 10912 bytes
SHA-256: 8c2b5524cf1bf087bb979ed5d84dee4695fb9bd1aeeb36b82f7c8623065a6820
font_01_sfnt_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 16864 bytes
SHA-256: 1a0dd12a0887c4e5d25af0117300cc811cc2d0fa30da8e04fe6711d610c84af2
font_02_sfnt_off00012968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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