Malicious PDF — malware analysis report

Static analysis result for SHA-256 830710b3b3a35d9a…

MALICIOUS

PDF

111.7 KB Created: 2021-07-08 09:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8e352c0ea348bd2082ecc5a528471a4a SHA-1: 9f69e31a6dd60352fb126486981c704dd6d2ee98 SHA-256: 830710b3b3a35d9a784a95e7e3a9fec44b01ba72a074e299c92d62a6a86c1021
224 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a phishing lure, specifically requesting sensitive information like recovery secrets or private keys. It also contains numerous embedded URLs, many pointing to compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://asiastudy.in/ckfinder/userfiles/files/16604436087.pdf In PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821f8e912cb---82870160946.pdfIn PDF document text
    • http://yuha.be/_files/file/45395227874.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/vegejegenepebasix.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/tuzunulidojijizofus.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dac0eafc15---disitefo.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/bb0bd287c498d00928464e60bcf6e91e/41111692491.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d2892e8942b3ae647c430191838aaa72/suragupupobexe.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/eee073b98906891b5695b74d4c3dbf0b/bogafovewepefomelurek.pdfIn PDF document text
    • https://carlojans.com/cms/file/55515540101.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d7ae3c47f8fd9a04dd1dd9b444afde6/27541390321.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/8b5c88a70e63e2e6470772f970e8ceac/zagub.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897558a5930.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/rujifopuxap.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/44bf57466795182defa29f6b846542e3/lifiwutakajipus.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c56d40a66db7b28d2b4f17e3e2d62bd8/51307775165.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/eh5ev9hru8a0a3jqu8f04glnej/9239901481.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/68621715201.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/dobiguxiw.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609102e8f339f---69972135680.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/niziwobuzasubed.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753b25ec652---wonarozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+tv+download+isoPDF 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_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 17628 bytes
SHA-256: 93bfe04e1dfdeda782c1b866901faf1e593dc72a68fae9b284a4094ad8673030
font_01_sfnt_off00012521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12521 10244 bytes
SHA-256: f9389b291903167514f9f790c6d4ffe8c92917ec8a310d2e8c902118e6a7d92d
font_02_sfnt_off00013c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001545b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1545B 34300 bytes
SHA-256: d0faf9e9528b80d009f7c8706df95a0433399d11bbf36882293985ddef8118bc

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