Malicious PDF — malware analysis report

Static analysis result for SHA-256 32e33f402881c461…

MALICIOUS

PDF

74.4 KB Created: 2021-09-07 02:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 10e1e83c669d6ed50691b29c5eea0ea8 SHA-1: a63f7509887848c4b5887db3d098a6a6ec6ca0b5 SHA-256: 32e33f402881c461d97c6e29ab89f8261131f6adc362318ef00a9a7caf4a44d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1ar9go85udetlj8r74qobklu11/23192091455.pdf In PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134944f61805---61124223296.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/dabuwusukiwakinosevabu.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/mufudavutip.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/dirovibinuvijofesutar.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609bee2797f18---povuguwenaronedo.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771f2600e34---92339781589.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/55983668031.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160821ce45c86d---66968032233.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/71881618708.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21f18d1bbe---zetokupirirojafewa.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/xipuged.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/zetamumofolanudobegokugur.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/giboze.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/kuzagosix.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/dedotalejuwixomagitowixi.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/tunudofewowoje.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160ba93739224a---jexobitalobikeja.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/rukojatemagujidetofazon.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/88078629756.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/2c986a7s8g2biaa9b4vl01m2ps/dorowazexukez.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea028de2f7---2186799993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=jebsen+taylor+hand+function+test+instruction+manualPDF 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_off0000c0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AC 11088 bytes
SHA-256: 91a007126c7259dd2013c04b30f0dfb8b2d69b0d1f912b6c61eeaf2a8b912238
font_01_sfnt_off0000da5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5F 16296 bytes
SHA-256: 6367c61da7e57ba3ecfaebf27743978ee2151a4fc834da1771ec0f0cc3716545
font_02_sfnt_off0001039f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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