Malicious PDF — malware analysis report

Static analysis result for SHA-256 65187e64d5229c28…

MALICIOUS

PDF

92.3 KB Created: 2021-09-03 06:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd6364fd436e606a099746c8ce42688f SHA-1: aef123590205ed617220d662b32099d7909be181 SHA-256: 65187e64d5229c28f3ac49ce3a4803e3ba8976aa54d77dda8e6ad37798e4596b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/53e8bd275b0a403de19701a6a4be0960/wirudanatuverirezixumubeb.pdf In PDF document text
    • https://avela.md/userfiles/file/wifuxulodenotujogi.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/vuzilo.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/futonaju.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/07337e1e796b1e24ab7104794f817680/93348688934.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/dekugukitomafagaxorata.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/17518534417.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e0afaf74b26---45344084349.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/49247605846.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/ruvipapexuvage.pdfIn PDF document text
    • https://cape-electronics.com/media/file/56573278596.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/1cd72a064e734a37181d7de736e6db2a/wafonedatenisep.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/mibug.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a96d2b4eca6---kajuxogipabowinaz.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fdc6aea45---39933806479.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/29797020992.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/kipebuzanobesuxizigujisar.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/45115484944.pdfIn PDF document text
    • http://msiutilities.biz/documents/30234570072.pdfIn PDF document text
    • https://isosklo.cz./uploads/91676599596.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070a7e91c07d---nexexipekezujebuwatupu.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/37919977849.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/lifotejomotumuxol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=vivosmart+3+manual+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_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 10668 bytes
SHA-256: d014b95db93fcdcda65d1352f70f9604c3edc17a793d2776bac187b9b5f0ff57
font_01_sfnt_off00011b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B66 18492 bytes
SHA-256: b37324408ddbd3335db8efe6e6c73b0a3d2684b54682e51485d422de9b8dff6a
font_02_sfnt_off00014b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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