Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fb549729eaaaa8…

MALICIOUS

PDF

85.5 KB Created: 2021-09-08 01:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f6ef55e40b381a681672ca30c73c93f5 SHA-1: f6266dc52e717b3d9808e4bb4c3a315c8665de98 SHA-256: a6fb549729eaaaa835ff54e9fae18639e5dd635a2210114a5cf071ebb8aa975d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/de2nb5n4l17llhjvttbv6jdtvd/sesujapuvapelew.pdf In PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb614d3a37---nasawuwefirov.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/vakoxudumo.pdfIn PDF document text
    • https://mfdesign.hu/files/file/62523348789.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/lds9e3s5d5td123psn1dg7kdj1/91767762534.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/25406724732.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609c807b65341---65023907725.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ujqtbqcafnonf8g8gon5degmkj/37116360681.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/32300240360.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/gepafuzejolilepuno.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/58773447272.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///43744589532.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/folubudefonogifoja.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/zawometafepewogovizajixo.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/63251783042.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a63e0f681a0---robegibasiledufawod.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee43f0c68b333a86299efb8278ea377c/31611347247.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kah5f1qrt52ap0sgrah7uohk6s/22216534256.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/68312680133.pdfIn PDF document text
    • https://sinarwaja.com/account/files/ketovuvebosa.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5105006cf---xadukuwozimolafimuvolaso.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/t6q21866qgi5o1uko6vte02efj/pepunosiwabevafeminowud.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1629838613.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9afe7acb94---kopof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=retencion+de+placenta+y+restos+placentarios+pdfPDF link annotation
    • 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_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 10772 bytes
SHA-256: 0e89983ef4eeab267fb66dafeb44070e296a834abedc514342d7d371c45a6934
font_01_sfnt_off0000fe90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 18764 bytes
SHA-256: 742e8bd19a52dfbd7c00fb45d049267fc1562b1a32a847eb9fb67d85fa700240
font_02_sfnt_off00012dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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