Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed08ab1a05f3be4…

MALICIOUS

PDF

88.9 KB Created: 2021-09-06 20:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6668341a4a302b48de6e8630085ef22a SHA-1: 0e38c17882d212744bc9fc1366688601ffcb13d3 SHA-256: fed08ab1a05f3be4913f8061d1df131cacac85486cf1b64fc89d5a9aee6d98bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages, suggesting a multi-stage attack. No scripts were extracted from this sample, but the presence of many external links strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=paratech+catalog+pdf PDF link annotation
    • https://almondzwealth.com/administrator/imagetemp/file/19887017351.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a01fe9719---91027391791.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/kexedaponewusivomimo.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/nanulezowevekemi.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/608309bbeaaec571f7d3d51ee12d9f91/41938043698.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/d3f8837ded5f81889b9fd93f2aa34b64/76508705671.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/bfefe021b5ec133084945f4b2932ee2f/nigadekazix.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/51331329964.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/75748670430.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3625b5b92a082c13169d39f435105d19/6739493485.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/timejunojubade.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/razufewebunexumexibuk.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/5b2b9a8e05d0f28e8261e0906fe7c0af/57730183773.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c0b8329f301b7a28195721917e9fad27/17704331637.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/15934024836.pdfIn PDF document text
    • http://minhanh.com/files/zokipubabaworojudax.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/nuvapediguwofo.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/koxiruvijimenob.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/rawudofoser.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/6asb8jmjoh0hctl5v2udvkrk4r/31971452431.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/95740645010.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/22693712904.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b64a2b6b---81962497393.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/magepubokipikizagok.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/543b48af955839044e79cfabfd2c278e/fojopuvaxevulawomub.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_off0000f63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63A 18664 bytes
SHA-256: d0e9ef158f3e6992e15ef84888ae1d2be1307d82b4ab1c9376cfd41893b93034
font_01_sfnt_off000125d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEC 10536 bytes
SHA-256: 74456ed4b50f5b0087c3ffba3b08784ff52d9e0da34bc86dd1369e65e59adf5d

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