Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e41ccb72553e1f…

MALICIOUS

PDF

83.2 KB Created: 2021-08-14 21:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f964eff486f800a8599ba548a5dd2297 SHA-1: b688525417a12d67d3a2e6e194b104b530e3476a SHA-256: 70e41ccb72553e1f1a97f4021d82b7fc8edf2ee5e532cd00e78ebbfffacb09f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests the PDF is being used to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://yourtruck.be/upload/ckeditor/file/19219962845.pdf In PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/f783b046c66b6652c3260ceb9cae1712/loviribari.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/69175199889.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/dd47d8904091c37acf4c6e0944d51844/1049604627.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/31330456763.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930011b2c02---zesegemifize.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/varokawomojodab.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a2add153ca5d7ea5b30a3b1eeb68d1b3/jopujomenuwewepon.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ihmdtgnmsh7s7cq2ifnrm2pk23/86240994143.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/rozakogivunog.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/upoel1qe9b0qqltgurlvh38j5j/nolaguniritolunaw.pdfIn PDF document text
    • https://aedwea.com/upload/foto/71467082699.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070be49ba0b6---75320779319.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/sebafopexibuwagobariko.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cf1090784---kidetorebafajepovekaxe.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/68744587002.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/243507b26cc0dae1172aedb4c169959c/47868633787.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/70028608355.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/66591882184.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4dff50d3cf---84475030112.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210814_165940.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/27b924bbea1582cb2f1ee6951d9d7aff/7218652958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=li%C3%AAn+qu%C3%A2n+mobile+apk+%C4%91%C3%A0i+loanPDF 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_off0000d069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD069 11172 bytes
SHA-256: 9eebafd34533640707554827a924ab8e3df0ab76c3eac6e8c3bd2aa41aa87303
font_01_sfnt_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 31356 bytes
SHA-256: 1629717baa4b81d0d819883fd8717960161df9b2131a1754ba01cc00ec86ced2
font_02_sfnt_off00012580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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