Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9813269c48f1ec…

MALICIOUS

PDF

76.6 KB Created: 2021-09-19 17:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 412896b2300b5f2baf5e97177db88e57 SHA-1: 249bb80dd019973f65194efac4ecbeab0cd1499b SHA-256: ae9813269c48f1ec48c55dcd54b482e94252a2fa85f200d8415ad0c07f36305b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple external URIs, including links to compromised CMS uploads and link farms on disposable hosting, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://thanhnhomdinhhinh.net/uploads/files/nofarilufovamosidopomo.pdf In PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134bef53abc1---kabituwegat.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/xixigezoseliwepime.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/nolap.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/74063438004.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614631848ece3---wufoloxojupagodale.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/8606135170.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/80911663699.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/f7efe3ho48a3519ac3rokhm6b5/77902922151.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/2345757332.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/kisivoriv.pdfIn PDF document text
    • http://katachizu.com/img/news/files/zekixinukizasetozofiboba.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/20728849519.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/13064a6d57e910c708722a74047b1252/nizolikagunej.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133c871e7021---94415712656.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/movolunalasikomivopet.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/1838933748613e6eef7047c.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109050925301252.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/18769857343.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210919_1FD7679D2DD90E7F.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93393254673.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210903191110.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/20573443936.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/naxasoza.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/22087119946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=helium+app+sync+and+backup+apkPDF 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_off0000c6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000def4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 17196 bytes
SHA-256: 3633dad4ec508d7fc77957c3bfeaa2b3a64a4e0909cdbac2968d4b220f18897a
font_02_sfnt_off00010bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 10792 bytes
SHA-256: bd0f13c0105ed76934e7bf8f54042ff56dc1a2c311c68e619ce602a279e90fd9

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