Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e51a4756453164…

MALICIOUS

PDF

77.4 KB Created: 2021-09-06 20:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 462ee377c8542b872e25d11966813b52 SHA-1: 5632684f5214c41a56c9fb28e82a93cca4be07f2 SHA-256: a7e51a47564531646a71099896751ba05ded54d8d6d5f8c447e5630056c22f57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through a link farm. The embedded JavaScript may be used to further obfuscate the redirection or initiate malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 https://chcial.ru/uplcv?utm_term=fluke+t110+voltage+tester+manual PDF link annotation
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/9727dd1fed558a20b94a582b37d8c6a5/29327535719.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/12719027218.pdfIn PDF document text
    • https://kopari.hu/files/file/62005175146.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/loxepidova.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/8096031091.pdfIn PDF document text
    • https://beaszemin.com/files/piritusosejazurogafo.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075c5503dc49---vagoposazixikapu.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608586b5acf62---75902271308.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb7ae0c042---vokezase.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/15211099567.pdfIn PDF document text
    • http://stonebreaker.at/80507967725.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161255f1598d5b---wetubolorukovabarilisa.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c2c89cff17901fd2e8bacc1d8ef6f6e1/silanazimumefadumopejamos.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/minuva.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3e636ff761169016ab2b11d98863caa9/22866305232.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/nuzamijulowedoto.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889a58d6b82---guxaguvama.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/49160471390.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/95499929328.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/kunqcbf3ngb2q8kph4fm0plo53/mabunoxesodisavesidu.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a980cd2e9---93420112170.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/53317101158.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613116283d1e4---46434329584.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161188e6fa30bb---48322389802.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0040a4c8b5---zixewapubunejik.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/49896923564.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/51299510056.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_off0000cc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC56 10768 bytes
SHA-256: 7bbf6950a9c88ba523646d1bad80ebd11777468e9341fa036b9fd4fb2bd54cfc
font_01_sfnt_off0000e534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 16524 bytes
SHA-256: c38fb786bdd2b6663b64639a1091ee6f6953f78328a6e3de0c156d94ca6d2143
font_02_sfnt_off00010f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1