Malicious PDF — malware analysis report

Static analysis result for SHA-256 512ef1d5aebc8d0b…

MALICIOUS

PDF

86.5 KB Created: 2021-06-27 23:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8c528b6e43d373f070a1d6401e796367 SHA-1: 42576132aef50575ef5c72f81918132d24ac553d SHA-256: 512ef1d5aebc8d0bdb2440884fa7ed05251426235bdcfe909a0bedfc0a2b6112
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is unreadable binary data, but the heuristics and URLs clearly show the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d42aaaca1---lubofas.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a73eaa3e3f8954f36256b40829f7b474/nebunuteterabidurekijixe.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/4273393744.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/3636205465.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/776a0458e752d273d58802e64f62bc1a/jerilojixuza.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/be56db1f0a9b6bb20e405cdd3d101154/59259393975.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/92242796685.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf6afd4464---52308179456.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/95fde38686071bf48577afa57ee8494c/41757028218.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076a3f74c9f1---18409449215.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/e1lgm7n56bosfeh4hp4br03t9b/35640267210.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/64390912345.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/vebituvawenumef.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba34b16f86---tunotigoxemurabizo.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608a14c7595ba---33243409485.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/eda6e527c2fc4bf591e669c2f84b455d/52889962662.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/74066466271.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/gedoxu.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aa58357bad4---gokapelexaliwubutinuw.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/03af557c5628b3afecedfd197a6d7099/gimawetutisevokebosipukix.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a961ba359be5a6e56c7345a4a6cd2e03/patevutinudado.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/134ab8b9f60676537dc803d473511116/zuzumivusodemajakezazu.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/97740154108.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/mafitedovetetikiv.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/sosinagezepugeposatiti.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c60191d018e7d5539debd15d0ffcff7f/26238805859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=simple+drawing+of+a+personPDF 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_off0000f237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A49 16148 bytes
SHA-256: 48d84a3c51f486afb16402a36e23eb878c4e7f0f9a64fc70220fcb6e2f04f680
font_02_sfnt_off00013401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13401 10904 bytes
SHA-256: 84d8b9bf1023d82ae7a77c2b844d84b7a9ac2ede46ad1f8217a96dafccbc9586