Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e3278c980ed6f6…

MALICIOUS

PDF

81.8 KB Created: 2021-07-04 02:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 20dac5d93585ba61e09a3d35e2f62394 SHA-1: c1ac4d2cc62ab29c3b1450f5134db5b527297bcf SHA-256: c0e3278c980ed6f62388873d4fa9726ff50643df5859730504dcd3eadcd0acba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The heuristics suggest it functions as a link farm, directing users to compromised WordPress sites, potentially to download further malicious content. The presence of external URIs and the 'Fake invoice / payment lure' heuristic strongly suggest a phishing attempt designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://catamma.ru/uplcv?utm_term=strong+positive+correlation+example PDF link annotation
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754ba759d15---99324310394.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/4m5v160ouqal40jblqanns6uh5/lunupujovalimoroniwav.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4765adf31a---27702788492.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9778637f95---1584869091.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160878c9ed1a6f---94893720789.pdfIn PDF document text
    • https://birudongker.com/contents//files/lopijutelemomivaze.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812a681104d---45863601129.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/5c673ad91fcf851d9aa736069eae7ffb/50092101720.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c310aa8be31---fojusenalebuj.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094353e5e3d8---24822124158.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/83f0647c95481e84885a1d8bb9cee9f0/tukegabibalawe.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/torovelixowotodigoj.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/xizazi.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0b1b438ebc7ba731291c66881f2812a9/93165229759.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/dujaxoxipujumabiz.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160819ec746616---sovememujinab.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ubjhse18r7a6bjmdlpgf30v65/miduxuvomiwoginotanosusal.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/leloniwarexopodefulakake.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd8d9b6b48---jawolofenolubef.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/221a6b700848f7ac81f9a9d2131d2f23/fajuvozirot.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/junefenanog.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702d2df39af---18936945591.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/25462494162.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/29847198582.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2B 10960 bytes
SHA-256: 294f32df081cd0dd60f2644d904ac87c8c40c2a90b0f8659360d99cef93d8b8b
font_01_sfnt_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 16800 bytes
SHA-256: fe2334593952abcec3172994a892ef478124e43be8f6891eade22a6543ac6f72
font_02_sfnt_off00012052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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