Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e44440757dac0db…

MALICIOUS

PDF

86.5 KB Created: 2021-07-29 23:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2ee47abbfdcb7f4690eee86a931a5f60 SHA-1: ba048b055fab751bbe9d1d0b0907f1c8776ad1bf SHA-256: 8e44440757dac0dbc6d32766440618bb3378686eadf3ce3dfca43a47a19f3f99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. It contains numerous links to compromised WordPress sites, likely serving as a gateway to malicious content or phishing pages. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nomylo.ru/uplcv?utm_term=are+american+pocket+bullies+aggressive PDF link annotation
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dba9c7b09---fikoduwonegapaxo.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/tukezonunuzipevovan.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/mobusimifenosutelipo.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9632613f---febuxorafonudofu.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/manajakaxalifidijabulavi.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/luxigomuligifizaki.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/261213287003.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/159268466760c8ea15e9e4d.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1624246107.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/78191556924.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/fakeruvovowavo.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f19647503bf204d3cfd7b58ef9fe7f5e/mopawoxitafonaduli.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/muridise.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dab0d917e36---gunuboderemelaselulisi.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d22d6e9694---kasewifovogurasalaxix.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef62318f69---50650582586.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/baedb2dbd9ef51426e98516f23998c5a/daselalebuwevevevatakasu.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d1fe9c6d8---79252343206.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/3285029134.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/27936601941.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/23317309633.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/juvupanutibumone.pdfIn PDF document text
    • https://dm288.rs/slicice/file/xumaxadefim.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/rawasibimipewe.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_off0000ed41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED41 17244 bytes
SHA-256: 28b249f42a62ae3f5b6e801b7c49fe30cdb34d908e5a34c59583f3668a931469
font_01_sfnt_off00011a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13228 11096 bytes
SHA-256: 9c0ee4d0bb963c351d13ff3d5f5331d8e2707b4f574c582062e42ae5ff4b1351

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