Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d226d713eff29b…

MALICIOUS

PDF

80.3 KB Created: 2021-09-15 16:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5f60d589d7b2cf23b05621f2d59224ee SHA-1: bcb83d037556b4a8fb3673871d9625dedf5daf9e SHA-256: 84d226d713eff29bcd9d5dad7a9654b78d562dfac35e838567581e68cd450982
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs designed to redirect users to potentially harmful content.

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 http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/sr17lenikupces1hcek8nee8rn/fojaniwososupiwumutugexa.pdf In PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/93957387245.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/jikijiwifupoxu.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/nuxapivamivewez.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/jepupibetajirumeb.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/muboxixaguvel.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/17588193090.pdfIn PDF document text
    • http://dnepropress.net/files/file/42551587712.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/14c2a3b7f2bf621be8b7f5d0b79c363a/zufifovajiv.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/72514433816.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/sujoxusifavajanonofuri.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/17240805159.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/sirozogumukazebakigitafe.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/85487395785.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/30459264717.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/fotijafelejilijexom.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a70e1c2616---5100743647.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/20721405727.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/9426947756.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/watas.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/rurikodekopemafuta.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/75997101345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=point+click+adventure+games+androidPDF 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_off0000d5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C1 17172 bytes
SHA-256: f19cf9b80d1e7aaf811b2f77baeef3e5e85f9f818f7168fc8b3fdf96ba1c83bb
font_01_sfnt_off00010272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 10972 bytes
SHA-256: ac256c5c1350d76e3a26f984850d610fd75dbaf807e7d8397d0d11d7df388ba1
font_02_sfnt_off00011bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1