Malicious PDF — malware analysis report

Static analysis result for SHA-256 132f836a7fa4c569…

MALICIOUS

PDF

88.2 KB Created: 2021-07-02 19:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 215cad93eb20c732b6e55c41278df3a5 SHA-1: c3e97cc54245dc5ee01fcffbe2a9d0669f4c6631 SHA-256: 132f836a7fa4c569529956ba8235d1e19f207f781dec5d2ce377ce2a4ac13c4a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The ML classifier and ClamAV detection strongly support its malicious nature, likely involving the exploitation of PDF vulnerabilities or social engineering to achieve its goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://ketchas.ru/uplcv?utm_term=acls+answers+2020 PDF link annotation
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/1ioe2pmb04u9vh0m84uiu5etf0/74265376285.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/bccdc87b2331e0168ab3b3f9949c539e/16382875161.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/l1rkg08gh8hqgequtl80unk1g3/20846301253.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad7ba3f244---zukojuxemed.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708e1e4f2eb---54735798338.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834fc23c66d---dezez.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/68786970426.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lomagi.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9ul3le728fc0m9noo6vq3off3p/zekafetopudowojadarem.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/89367031955.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/81667193427.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6ceb6f266---42631855550.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3caeadbcca87f682ac3bf32e082a5c30/7550257582.pdfIn PDF document text
    • http://simonide.org/userfiles/file/vezutubumaloxapufom.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb3578e169---vebosulexemu.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/mutan.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/27463300577.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073531420af9---13572645541.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd8ad9e004---77118368775.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809381b504a---91247413198.pdfIn PDF document text
    • http://advicetao.eu/pictures/file/tevenefigukixivowewekadu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9d4f18530---91726420510.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/29616872996.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l53r8n5g9ptvg01g9k5gjs2p94/43910702301.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_off0000f71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 17584 bytes
SHA-256: 9368f12a3f70c471ad898605f2a6a400bc7588181862515a1003c804fd62bf77
font_01_sfnt_off00012482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12482 10220 bytes
SHA-256: 73ab8faa3325ceca407f36bb25729ce97cb803022a26ca17686f60234c90d615
font_02_sfnt_off00013bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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