Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d81220cf02bc2ad…

MALICIOUS

PDF

80.4 KB Created: 2021-08-25 05:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ed82b8e914effea5681bf0887ace7e21 SHA-1: cd64cba55c1359d36199219c9569377f27ce0b5c SHA-256: 0d81220cf02bc2adfd04cd58891958aa8fb390dc8b90ce7b8fe9ddb364fa03af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to external resources. The presence of embedded JavaScript suggests potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=organometallic+chemistry+and+catalysis+didier+astruc+pdf PDF link annotation
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/tm3f3qnvk3qhfi1ss2ifk4re88/kerijexinigefaxudiwavepat.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/genefawini.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/befumusivamozofisedidonu.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/61219143595.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160fb62b2b62c9---40056521949.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/54359237474.pdfIn PDF document text
    • http://change-sexy.com/files/files/50633613366.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbdc87131c---mogemibibuladiji.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160c259132273f---wuzetafukisirovutivelek.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/suguvozowinibowaxodorixe.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/292a10473e4163c6ccf5c85709246a81/tateporateboberudiwelere.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/xujokefumujuwinonerigufo.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070257ce6dec---detazejapud.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/bivolor.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/xupazofesivorigakesizatiz.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/65681509927.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c113faada0c---12268295625.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090f8e58b5ce---wekesepuzani.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/15991713932.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/72559441301.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/94730959814.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/5b4b0fc21739c8da02cbbb0fb745f071/suwoko.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fa027ceba---sijekuxidagurijafejo.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_off0000d3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E0 11304 bytes
SHA-256: ccb00e061cd892b663b0b4f87f651e5f57ea0db05b5e16fef287efd7fd8c3dd7
font_01_sfnt_off0000ee19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001062b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 17428 bytes
SHA-256: 8d9b7f1d01402994af02171ab4f5ee51f268536165d265c09367ef2ad388ae3d

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