Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c17aa5371efef8c…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 21:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 248321c272bc241582c44cb1f404167d SHA-1: 08998ef8422cda0242a729ee9f97e689cd27be48 SHA-256: 5c17aa5371efef8cff7f100e3fa5a33c57225c3e5eda30866773fc6d469119f9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://areaengineeringsrl.eu/userfiles/files/zivefegulanumajelawef.pdf In PDF document text
    • https://anitt.in/ckfinder/userfiles/files/88265268900.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/esv7r2o8tlo9vsk4k359dror65/58269730025.pdfIn PDF document text
    • https://aspirans.com/files/file/zidajaripidu.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1630768586.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613334a89b197---rebeka.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/21054250950.pdfIn PDF document text
    • http://newo.ru/files/files/zakopuvujexuluwoginujuvux.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/1271956203.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/83066143393.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9818d8cf7dc7f7866b0c3a90ca1be871/81945715759.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/vumudotopewareta.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/24585169745.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/topowata.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210906_CA7658F5FCFD4962.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/38977191783.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/mokovizago.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/vegorulajusiwob.pdfIn PDF document text
    • https://mahae.hu/files/files/momakobevarujug.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/pilarefadedikidewajodok.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/kalutidakirixiwida.pdfIn PDF document text
    • https://producto.works/userfiles/file/rigaralobedixutinar.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/48150810985.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/rawabuwixifipu.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/vekurujoxabidod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=9anime+app+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_off0000dfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE4 10312 bytes
SHA-256: a24a245c6e7747ee9a54d6fb9f245c694050a9d629a93355d4fc6dc3a696e04e
font_01_sfnt_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F12 17932 bytes
SHA-256: 1c396d83d11f643f1f2676363016646d26dc7cb7d120c586b5edeb51a695c5a9

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