Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a4c173ccd8cc1e…

MALICIOUS

PDF

88.3 KB Created: 2021-08-14 07:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 12b2ab6e5d302452262979330bd45746 SHA-1: 73d36569cc9e67b5ca81a0e204882a739ddafc96 SHA-256: 92a4c173ccd8cc1e162f813d2d26c948c6601863361f0f7035bc4b26ea07bb20
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. The presence of 'invoice' or 'payment' language further supports a social engineering lure to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pistant.ru/uplcv?utm_term=sample+authorization+letter+to+collect+birth+certificate PDF link annotation
    • http://golden-candies.ru/webroot/files/files/61956011981.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb7dbd3d1c---gafajemesepoduxapexijunej.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/44006812017.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9aff70b6f4c04c9fa48b591b8eeec4e8/togetisodaweguzidato.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/midojudotuxoxo.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070cc88bcfae---xobugomitaza.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d50f5752ef---litinobesa.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/nojerib.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/59055258304.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1c2b5dcd6---74937768620.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/8d18265ba101ddd9a4a1f6e116c45802/fatujewazuvugaxipikogokon.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/sapojomutes.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/kijowapidaximiliguwos.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/bebajezenorinu.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/motizolanumegemovo.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106281459201836.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb519de556---jitusimena.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/2019412072.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff188055cd---42840105551.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021060813165880554.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/21838325086.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/83851023716.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608966cc136fd---94234640075.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb00f824f2---kisuti.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_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 10952 bytes
SHA-256: 2a7e0dce5945cbe889d2bb56139d5cbd54f18f929e50329ee2f2f8aba6e28dc5
font_01_sfnt_off00010ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B7 17140 bytes
SHA-256: da1990f4b31cf71466e2167b0574e4fb3ab0c086d4f3374269c2a23929d0ba15

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