Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8c6d76cc0b391c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-21 19:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e225825bab2b90594999b216a8460ac2 SHA-1: 7af4c890df50f346f690fd52b879cbeaebb8093d SHA-256: ae8c6d76cc0b391cff003756bfb6c2fe9385e9ef1a95cee27ba86ef87f832a38
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of external links, many of which point to compromised websites or link farms, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 https://archism.ru/uplcv?utm_term=tipos+de+obesidade+andr%C3%B3ide+e+gin%C3%B3ide PDF link annotation
    • http://gorsilawfirm.com/userfiles/file/biwolukusugiki.pdfIn PDF document text
    • http://arsvet.ru/img/upload/66973953496.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/2980116154.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/vekanozezimawotelos.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/babifomonulunafuliji.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dd2713c61---damivadugi.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/65662964497.pdfIn PDF document text
    • https://znalac.com/userfiles/file/93397058081.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148b13dcf093---muzuzuvidufodofinavowogu.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210912040320.pdfIn PDF document text
    • http://www.heksan.com.pl/file/pivejibimasew.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/5155149315.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/64573174358.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/wefuledizupadoj.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/gugegijifobajunov.pdfIn PDF document text
    • https://tonitomov.com/picture/file/46072103468.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497fa398ab8---lilajidirukon.pdfIn PDF document text
    • http://parfumland.sk/upl/sadodiwas.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/65231130371.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/69750008529.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133aeda2ebc4---69637966338.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/72155487361.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/sujabagebarujo.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/5784188292.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/81993904843.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_off0000daae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAE 19252 bytes
SHA-256: 7c0a48940c9b21463b406ba3869adbb6b10f83b440f21b3d4224ad53843ded02
font_01_sfnt_off00010a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12236 10664 bytes
SHA-256: 157760990d3440ed0a25a5a8f4135226e2135006ea2fd6ae7cac8a0f08f48503

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