Malicious PDF — malware analysis report

Static analysis result for SHA-256 7812928992d8df46…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 02:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 06bb5237a7c7307bdf3426716ae95830 SHA-1: 9af5f112e857a76bb79ce287f28b068417fad117 SHA-256: 7812928992d8df465bb6e60f6f2494e45ec7c2eea81a7c4b01cc35cd9343c44b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of embedded JavaScript (T1059.007) indicates potential for dynamic execution of malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://jyjwqj.com/uploadfile/file///2021091309043337.pdf In PDF document text
    • https://pointvirgule.ca/upload/editor/file/xujofejobutipatagojib.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/gupulupelaxake.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/3821468505.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2f8503a48---tezulupebufiwunuf.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/21865192760.pdfIn PDF document text
    • http://quetthe.com/upload/files/30545585335.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/bemonudunumawakiradekuwo.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109061509132972.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b716c4616b---21201659523.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/81463498634.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/selovetarivogexorerodi.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc7f86e1b---60535972763.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/161613393.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/xexuvapekolorefus.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/82538539607.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/wamemitodun.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/44121604728.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/xivalubaginemipulenabop.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/91422561891.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/63674752365.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/lazigawawikedazalo.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/gevilixuwufeperuvobajuk.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/39644525624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+unlock+locked+phone+patternPDF 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_off0000af22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF22 10620 bytes
SHA-256: 25f6c5d2efeff8b42d956d523852340b62e6e7bb6f53197d6c123bb561e8b9a1
font_01_sfnt_off0000c760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF72 15352 bytes
SHA-256: 5a0d34b28e05fb64672583f73b59ff415b013b72056f4c6d7eb0dd0ea501a31b

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