Malicious PDF — malware analysis report

Static analysis result for SHA-256 76708228d2ba7042…

MALICIOUS

PDF

92.4 KB Created: 2021-07-31 14:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: cb7d7f8c348b5bde25c1301f33be689a SHA-1: 3d76c6bb7bbaa552e3a761b20725c6f663f27c7e SHA-256: 76708228d2ba7042e1828cfd9ee826352f57947e9149f8ae09781bb1cfa0d3ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

Heuristics 6

  • 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.
  • 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://birnagarcollege.in/userfiles/file/tevafudag.pdf In PDF document text
    • https://moto-trend.cz/public/files/fck/file/nokabidurupipopuf.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a12b9243a---76366581433.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/44563081630.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/58086356530.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bcfe6dc01---liwodowamusadotebu.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/7f9ceea69934e742dabf9d75d07542f8/tojogi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607435f4a635f---morujarib.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/xokawujetepovupesa.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/f47ea2ec7d5ac390e3cc091476e85793/67133930564.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082ad5ac237b---fuwirosaremujujafifesup.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ra42ppouhg7ha1lb8f9bdj35dn/77930332592.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/999a0887c531b61c8569e3d6872df734/sidezupimola.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/37848414.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91ed1d8115---55908113926.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/5edf39601d61fded04858d44465967ae/bugasotipazoloji.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/77456202747.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/41863529509.pdfIn PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/532620741.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48fd33c19---47026888248.pdfIn PDF document text
    • http://kasargod.net/uploads/file/xidutizisexopi.pdfIn PDF document text
    • http://mayjack.com/upload/files/44992698856.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f2f6d2062b44f509c8fc8131a5aa62a1/nofejavulitoruxuw.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/22809788090.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57956b6407---pakibasaxezujutalalof.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/97090535930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=gogo+live+mod+apk+free+coins+iosPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_01_sfnt_off00010253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6A 11060 bytes
SHA-256: 28860f399893dd3a9cf14df0dd93f18fd50b26ccd9fd8c45897110972a36b93d
font_03_sfnt_off000133f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F7 18968 bytes
SHA-256: a8ba95d1cb92d2a261bcfc206c67a028396aba5b858a8f5640bc46c403d15602

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