Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b4317a6f3d6d5f…

MALICIOUS

PDF

71.7 KB Created: 2021-09-05 04:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f85ac7816c2eb9a3ab69d71e1629356f SHA-1: 4128450ae8dcd50de944ace52d532662dd2ffd3c SHA-256: 09b4317a6f3d6d5f5747cafeb0c1db741a2a8201cd649908535f050f63e4820d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306898c801c---gitafazogedojejune.pdf In PDF document text
    • http://rideco.hu/upload/file/86080766839.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/lawivefifij.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/961f93237a41f626ac3340aca588abc0/garuxabinujifube.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/58947220483.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/gomexaxokisepokepedove.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/galuv.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/34959006835.pdfIn PDF document text
    • http://coffee33.ru/archive/file/wojonopuwe.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/95336008737.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/75cb6866bcc2ad1c061495f73b57fdfd/sorokasavuwafalumibux.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/88041508186.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/hq7upf4q8i08qmpsuvc62omc47/xebajexi.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5307f2c1b3---31972365004.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094b57c200b3---75397077066.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/7e1c06957e2d6fe4242e143e148fae8e/tisexijamizanisetagulubi.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/masebugelefome.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/1fj13736vmmf0k17sfee7opgkr/53028966830.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794b04901d6---nesuwupufub.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210727_9052E354D0DC0F54.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/rokonatife.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/q7m963i39te8h5s9vt9oaes081/45554989342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=grasscutter+farming+pdf+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_off0000b765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB765 15392 bytes
SHA-256: 465a25eb523c7d994b01e02a9e0391ff43cb61392b235e4b5a842f13d9c61487
font_01_sfnt_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 11188 bytes
SHA-256: 76d71082f578707d8b85d630c6bf83e06b3b0e851768195d498062495346da01
font_02_sfnt_off0000f8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1