Malicious PDF — malware analysis report

Static analysis result for SHA-256 8daabb0e4974b2f1…

MALICIOUS

PDF

188.4 KB Created: 2021-07-06 21:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 63fb8578387bb27d0489b3472466bee7 SHA-1: e21ae1c8f803d0e259ca7495b567441dee2941c1 SHA-256: 8daabb0e4974b2f1250ec8ddc0794f019ad0a3d7f2ae346aae6ed31b5c31635a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and contains no readable text, suggesting it is designed to be non-transparent to analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9031

Heuristics 6

  • 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.
  • 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://kameleonhastanc.hu/files/file/folevasinaxokaxereguwav.pdf In PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3f35c0ef4---69720158094.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078edcaccc41---55928670946.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c96966988---powiresanijuti.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/99145354289.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c24e21a5c2a---8949858689.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160734c49d45aa---56620930353.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/8690296298.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/jogubozemigibumiwijogit.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/23313074879.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a37d16d2683---bosijamezafudupokudod.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/nuxowarus.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/7d6f6ee9f123aa5e8fe75079ba897b2c/sogik.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083afe7463f1---vuxonegurul.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/51806640204.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/pixorowasaterav.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf6e5d640d---63159329175.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/wojimegetuzutujevagesox.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/14956589043.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/vujamifav.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/ca4c2902c431d28ce5827a6188f47184/zawofugefunutibope.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/clmkiglck0g4mantjgg7gj8uj2/kujafobajivuxuzukosume.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/0e6db7e4594a4c425a35f39144fa4b88/wumixajimilesorez.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/zufonow.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/60807941409.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/2ab840e5b4a298ec3331a6dbfbcead69/58882629578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ocarina+of+time+rupeesPDF 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_off000243f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x243F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00025c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25C07 18476 bytes
SHA-256: d306ce902936b55ae30d64f410f974081d8352808464bb8b2a19f27b0d3a5360
font_02_sfnt_off00028c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28C29 20708 bytes
SHA-256: 1419bd2631398c708176a24212e42853aeb39dc6d3a00d9c32697d4d4626f019
font_03_sfnt_off0002cab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CAB1 10720 bytes
SHA-256: 56f44829fe3b886b372276fea926405401960015da24cf44bc2cbc007af09aae

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