Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5485de8a64e2e4…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 10:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3130398895f0f00664361dd14d67b7c5 SHA-1: 2b689a8bb2af7f61644227daf97a6c885a95d817 SHA-256: 6d5485de8a64e2e4afb6355ebd3bfcb6beb2146651a7f05c219e464497f98e73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, some hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's used as a delivery mechanism for malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://autoprofi.ua/userfiles/file/37195839573.pdf In PDF document text
    • http://fra2ange.it/userfiles/files/30137601277.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317df6c62e3---zetexikiroko.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/kunatavilivida.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/28127894141.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/52385829288.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/gowunurasevigupidebixo.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/74650681083.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/nesagov.pdfIn PDF document text
    • http://kechengchem.com/upload/files/pobuvenasitod.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/24a70e3151a20cd3b66270f0a55b718b/givunabevagim.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/60768287018.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/dedebexox.pdfIn PDF document text
    • https://lordoptika.hu/files/files/45436885091.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/remelometogututibujij.pdfIn PDF document text
    • https://ksboutlet.com/file/files/1560281394.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410dd425084---43277254772.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/vutagawo.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/82990545292.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc66030519---jexamekutizivagojefiw.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/99801920684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=wren+and+martin+answersPDF 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_off0000d110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE922 18492 bytes
SHA-256: 6376539a38a72c9d53da8be82956c29f03eb699638bcf0b659fc782df5297980
font_02_sfnt_off00011915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11915 10320 bytes
SHA-256: c69a9654732bc7783c6a3dc0a99315debf556e7fecbb4ad632f2241ddfa01b34