Malicious PDF — malware analysis report

Static analysis result for SHA-256 169aabd0a77327fe…

MALICIOUS

PDF

74.8 KB Created: 2021-09-19 10:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c387842fc9075e8fd32b9b091d82896 SHA-1: 33c3a507642149776577280dbbb028603d3621e6 SHA-256: 169aabd0a77327fe492c4b15a43d60220dab98909007970e0ad8896f31622e71
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 or redirecting users. Several heuristics indicate the document is part of a link farm, with many external URIs pointing to potentially compromised or disposable hosting. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution.

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 https://archism.ru/uplcv?utm_term=robux+injector+apk PDF link annotation
    • http://itineraire-consulting.com/ckfinder/userfiles/files/81983133875.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/f2b83c02a4894418dce7370b62d7034d/10528684461.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/fafidowasijufirepe.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36735744325.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/80176340440.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/tolenibinudi.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/54459716585.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/xejatatupifab.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/69829097400.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/jodomi.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rexibivuj.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/xafovuli.pdfIn PDF document text
    • http://bronia.org/userfiles/file/8922624402.pdfIn PDF document text
    • http://iscelenie.info/files/file/belonoweremisugakuzopegun.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/felud.pdfIn PDF document text
    • http://bushurov.ru/images/files/66606207309.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a20a43d73---borijidunosaxipagadonip.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/4390771525.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/22033469893.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/kawetinujovevibobivapora.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/rugidolurokubapezomerazab.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/81944748426.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/99382097783.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f390bf3038---37362032565.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/14610620168.pdfIn PDF document text
    • 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_off0000c183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD995 16848 bytes
SHA-256: 4ae390495bdebfeaf9a4ff4eab4f669717634e07478122dc4feaca9501bbc802
font_02_sfnt_off00010511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10511 10760 bytes
SHA-256: b398541e51bee01734bb371a49fb3d3e6e2d648a2e8a39aa4d17d38b604a2d47

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