Malicious PDF — malware analysis report

Static analysis result for SHA-256 25785b237cf9c223…

MALICIOUS

PDF

92.2 KB Created: 2021-08-25 01:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a7ddc5b5adaf46cf02ce4cf0391ebe10 SHA-1: 70bb880003030ca46f44bb2337a1d8a9ad5f4594 SHA-256: 25785b237cf9c22332e26f2f9f46fbfde6c1c44bd1f1eb179f2ca651e61d1f43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing lure aiming to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117764246aa6---32810300747.pdf In PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/45035397802.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/bulideved.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/poweviwo.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/metod.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/tolokawot.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/jowop.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/xisuvukafusa.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1db69bae1---juxeselije.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/xudolibeto.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/34395824418.pdfIn PDF document text
    • http://goldmustang.com/files/files/dezakolil.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/gividom.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/sozulufoxaradokuxeruwep.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/45054465973.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b19edd85---gagijovumadi.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/modejovidowife.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607720f440847---59982039264.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/56115481384.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/50e36e55c05449cee71e84bce5b16dd5/wasasuvegapoxem.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/52965690289.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10a1bfeec---xesuxojedivafejidugifowuj.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/eqkd6kdh7nk12knj67kb8200h7/nilojunuxapo.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/xotokoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=convert+from+xls+to+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_off00010674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8B 10604 bytes
SHA-256: 925a10706e3f10096ec4e16befc973f3b4eb019c2b07f9823dbbdfd24b969acc
font_02_sfnt_off000136d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D7 16964 bytes
SHA-256: 393e9efb351087bf55f140d7573f45a03f527b13e07af886dac8f37d5596af39

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