Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44cd420527ec16a…

MALICIOUS

PDF

85.4 KB Created: 2021-08-16 15:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f59108d9ce9869a0b48509a5495ce0ad SHA-1: 4159f670029db2d9f0fcba1f81250439c24ee2fe SHA-256: a44cd420527ec16a6e935756823e04f71af99f230d8e63db3b9161956b66eaf4
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and potentially malicious PDF files. The primary attack pattern involves luring users to click on these links, likely leading to further compromise or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/gcdt58p2a7c9vrmchfsvvf24t9/fubadixekuj.pdf In PDF document text
    • http://giasuminhtam.com/Images_upload/files/gifipiruvokoxuzesowib.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8c8cd1488---zujagezevukejotatiged.pdfIn PDF document text
    • http://countryroadssiberianhuskies.com/clients/e/e1/e1b2222506e4b6fd6c510396e08362d3/File/51066671171.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48182f007---tesisu.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/dezovotev.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/7448104927.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/de5e6d3cbe16892f985bd8f25d5f5b32/49668035971.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/44403449173.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104b9fe16ffa---manawubes.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/bdab88bea773157b2758bf51fc5d976a/53584073517.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/jupovufuvamuxamaril.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/61715139399.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ae52f85dc9d8b730169ab48170295f92/litunetaxefumuropofavul.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/d54jgoml31p3pimm69k29m23av/tebavarilek.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/jisinikomupume.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080589f30110---53472240215.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b1814d8e---47340371089.pdfIn PDF document text
    • http://geose.ru/userfiles/file/57953378748.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/8200411535.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210814_3C4BF1A3C01AF5F1.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b0c890dac---biregupenipo.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/baxakedidoj.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/34256644880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=bajirao+mastani+full+movie+watch+online+free+downloadPDF 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_off0000e7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B4 16988 bytes
SHA-256: d9ceed30f3991099519db800886e2d51df1244ad380cc6f191a9f9119271bd7f
font_01_sfnt_off00011435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11435 11176 bytes
SHA-256: 6a2067acf1541666d73b932c35cda162ac9e2cea5418994c6ad1b1da53945799
font_02_sfnt_off00012e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1