Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ecc10d1b2e80fc…

MALICIOUS

PDF

159.0 KB Created: 2021-06-29 10:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6a655e210242dc6a2e165cd5b01da801 SHA-1: 084e8da2cdb35dc30455e7a15d2722dd75c1bb36 SHA-256: 88ecc10d1b2e80fc20348ec6ab34203d5b42377082b858ee599fa3e4ff567c58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9776

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 http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091de3237e96---pilizuni.pdf In PDF document text
    • http://100gastro.cz/soubory/files/94199733601.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/58495072251.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/99785397376.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b89e1e845---64782344158.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/74309088350.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/c76c6e595e18a11e1f0e30d5ecd20083/84224365515.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa024bb2b5---galulafuvugegoweripuxomu.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071a1d38a370---wedezojuvojegoregi.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/be8f6a12abc5988a0d89f27e1d6db7d8/sipalajomofifi.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b0e83d3ad---32007965027.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/lakazexariziwovenikovo.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/61598963380.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/93669069511.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160af6b5a2d5c3---jakopudetusoratapugunitu.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/xibev.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/1940a9717968eedd79d22d4d24e74461/71830263364.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/lesimitegibisaz.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/wamiwuz.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/wagarikokibideku.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/77594236556.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/1a95b6e9ff821d2af8fe85c6902becfb/80359634521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=science+words+with+kPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/977f788198091612379fef6091db69df/35113548248.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F94E 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_01_sfnt_off00020ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20EE6 18156 bytes
SHA-256: db3d29084956cb7bfe13fdcb82f508068db498806df16775408a025e547e6ac3
font_02_sfnt_off00023df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23DF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00025608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25608 10512 bytes
SHA-256: 0da530ab1da9b925b9624d19a97c2b5d604002b7cfd71d429a471385e32ff667

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