Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b761b67dc5e29c7…

MALICIOUS

PDF

89.2 KB Created: 2021-08-22 00:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 121a9c3597b3ab68f23cd6445c46716c SHA-1: 992d834a4eddebd8ae3f454d0e79602697137c03 SHA-256: 0b761b67dc5e29c7b6ec9b8de860c192d82574e45c073e5202d7317a2e850fcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URIs and link farm heuristics, suggesting it is designed to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chcial.ru/uplcv?utm_term=bitcoin+mining+simulator+mod+apk PDF link annotation
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff6478815---muxofekufumogamixipetali.pdfIn PDF document text
    • https://cubic.is/userfiles/file/kufavopo.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160780284670fa---86876814137.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e72aff6b5ab6fefe46bcf6562618443d/tesel.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/53c9f19956bf86da6550b19bfd3709c6/lajezunatibugofub.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/fubodilamijuzi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4578d2232---pidaxaredewifomobolivu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb0f6f3672---15572440068.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/sewujixakufixuvuwizak.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/metabotibodirusufiw.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/pokasekor.pdfIn PDF document text
    • https://airshow-bg.com/file/mozajagiti.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa788d07b6b---70179199320.pdfIn PDF document text
    • http://coffee33.ru/archive/file/rurikajafa.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/50157952608.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/d25428fdabcc922f0f46d9e0bbe7fac8/tijoxalumal.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/af75d9cb1c1cc2f43958f8e2c3de23c4/16323209279.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/77561833672.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/7a1a6f6373c0ac982b0543449f694dd8/rawisore.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/i08hdrdto2ahtg792emlt3cj60/70886132765.pdfIn PDF document text
    • https://service-panev.com/userfiles/zekonubenamufajakuvu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a203f43fe2d---jenelozifizize.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b0696e7a1882fd82a60037c475230ce9/66564866587.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/nezubovokubozidemeb.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_off0000f559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 17592 bytes
SHA-256: c5f0bb6032d40ec3882079ab57d6b94ca6ddb25a3c5c717f1294e3f51e2e6d4c
font_01_sfnt_off00012342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12342 10972 bytes
SHA-256: 7f86cf13bc7cf61face8ee13647e163312ddc1b0eeec8258ec8e0a67208876af
font_02_sfnt_off00013c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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