Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5ea8e280560a5f…

MALICIOUS

PDF

86.3 KB Created: 2021-07-15 10:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7c3dc7431a971292e739a80489e0bb5a SHA-1: e70532c7ac2f963b0db0364d73e4df556c86def4 SHA-256: 2b5ea8e280560a5faea59e16b2695fedb0717622485fb21a83f8767b560e3537
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://catamma.ru/uplcv?utm_term=academic+used+in+a+sentence PDF link annotation
    • http://doo-san.com/userfiles/file/20210518075705.pdfIn PDF document text
    • https://daismene.it/file/xugojigarub.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/c2c6142098a5835043bfb1238e533e27/dezatuvagezoteget.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160edff45ccfe9---98402385434.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e7dcc71b12da0eda8dc18f8195d68fe6/wivoz.pdfIn PDF document text
    • http://garderoba.sk/images/_file/35120123577.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/955cc5903e327a4938747e9b5f3454a2/mubazivepel.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/09fbcb3f2bab2bffa5c13f1346ba6a94/luvuziwadowagi.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/tarigonaniribozebezeti.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/kogubulivezuxojugezapa.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/dafb3c5b6cf22b2786616860c5b3d7bc/rumetariza.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d3b899e7b---36339013547.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/17417022921.pdfIn PDF document text
    • http://moneymaker-gold.de/files/sipopilavegakola.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2184b25e21---43584713405.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/zalisapi.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/11119527723.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/eg27m95a488elqqiue8417phts/12385740203.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/zikomavuteros.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/0978b9015cf471278ca535a9c8bcd1b0/89324330220.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/jexukesodasenaxuxevuweso.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/61377834823.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_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 16528 bytes
SHA-256: f324d1e29443c4783d9943550c6f264546e18124a1b1daca8b23d585e42d94d8
font_01_sfnt_off00011b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 10344 bytes
SHA-256: a50f3c4188462086f6891e42907ef8ac8e337853bb236697c3caeb3fdc4b38ee
font_02_sfnt_off0001327b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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