Malicious PDF — malware analysis report

Static analysis result for SHA-256 083e9a60ad6f9e89…

MALICIOUS

PDF

71.7 KB Created: 2021-09-14 10:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 75b60ad3a4652896057a0c36fceb630f SHA-1: 151ba93e63fd094bead4e4989b7974f0ee4ea016 SHA-256: 083e9a60ad6f9e899c0c48a99551f0e6e05ed368b1b9c8e69e48c439657546c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://villabrown.it/userfiles/files/68737832237.pdf In PDF document text
    • http://ymjgolf.com/file_media/file_image/file/misamaferebujifugelinuraj.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/seminetiwogobam.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/nobume.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/79378798129.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf9031eaf4---miboposexenife.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/26599492192.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/jojenekafozitid.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/12833207957.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/70702398769.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/jumew.pdfIn PDF document text
    • http://chemicalengineers.ie/images/radowekazepuvet.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db502b05e9---39042993804.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/61254583188.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/fajasofew.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/xixemaf.pdfIn PDF document text
    • http://panova-art.com/files/file/99352764769.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/koditu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/cumtoqco9fh0u6fl3nk46je95m/9650203638.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/xivuvizopo.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/luzufakovu.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/62665773516.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/manupetuzixo.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/c5367500bd25467a67666441abcacd6c/56391550281.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16133015502715---82966077826.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351387d7167---36510168883.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/97981987613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=android+canvas+tutorial+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_off0000b8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C8 15344 bytes
SHA-256: f46632940e88e57d64c47fad8e900326175bcaae4b69cf44d047fdf698f594db
font_01_sfnt_off0000e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 10628 bytes
SHA-256: 94a7d367d5beec27775854c11f1476be4ff6ca51fa92e0f1edac9221c7e5ede8
font_02_sfnt_off0000f8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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