Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc6d893acf469dd…

MALICIOUS

PDF

76.5 KB Created: 2021-09-08 03:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2408564abf81dc42350ae8fbb8f58332 SHA-1: e0aaa79fb0968da0c528a8c3136a3f183c93b24f SHA-256: dbc6d893acf469ddf79f3c0e3a540f98d46c27e727fa0ed215b1829ac8e8f164
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, likely to distribute further malicious content. The presence of external URIs and a link farm structure strongly suggests an attempt to lure users into downloading additional malicious files, potentially disguised as claim forms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.tokyomagic.jp/images/library/File/xosetiworiv.pdf In PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160da30225f85d---5833286284.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44142076169.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/66410881308.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/6c328d53f3a1b9bec47a1852903fa379/13546431761.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105587eab297---45742326613.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c082445e60---megegadejimopinigujox.pdfIn PDF document text
    • http://ewtch.com/upload/files/248294017.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/zasisadotebenuluto.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/murasopijak.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/g3tii09nq6pgnip8rthllfv4e2/jofesozifenetosurojik.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d6f4b03e2---xuvizevogesupojavo.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/75b514d117c4b22f07db0582fdb39b3b/jezanabugegetikono.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bf0f37c22---tovixumudazo.pdfIn PDF document text
    • http://slpclassof67.com/clients/45391/File/66721343196.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/kidarupazute.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/2ecf119e5b095a5226c78b10a0be3abf/85614877857.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/sebakine.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/84133345068.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfbe1bdcc0---fusipowudibotuzoguwupofi.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/benoxiwodepefetovenixizi.pdfIn PDF document text
    • http://watch62.ru/files/files/fapini.pdfIn PDF document text
    • http://elma1.ru/!upload/files/28019317355.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/31070892555.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b822d5055a9b5f3849abfd69418c2c35/bodotawimag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pip+claim+form+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_off0000c8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CD 10280 bytes
SHA-256: 6cb2d26b92d17f2d1786f4b922db3507b0e8d0d581340ba65e1c8bf851865475
font_01_sfnt_off0000dfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 17592 bytes
SHA-256: ac20ff0920d4da547b39f8021b62b6296619b9003e1b95ed58f49fbae83ce469