Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff6ef5c07b992c9…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 07:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 1268f45e950687ac40e2200624479146 SHA-1: ba467e595f6063ff237450a6cde216bc8d4298b8 SHA-256: 5ff6ef5c07b992c97491d9c2ee4d9139a0147607efe64a888547e72c2a034d6f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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 http://zatuchlina.cz/upload/file/tikusafemomemogejaxizot.pdf In PDF document text
    • https://amd-export.com/site/upload/file/64293077866.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f43fbf5de---73850284620.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0c7902c88---34023446426.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/1381296365.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/15uavh6r4hnq1t95ldtprh1an5/doviguruxazavudesisafeze.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/c316cfc93ed4c073b0489135f0c2b9d4/lelivewikogireribogebi.pdfIn PDF document text
    • http://supporttmes.com/clients/2/26/2647aeee05d38019bb2ff7af4ee9f9d5/File/jagoropazirojewonup.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/66104419390.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efb969a52a---linipo.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/jujavekejepegedufe.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/74930996670.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f44f003ac8---siwerofexoted.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/50377635482.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086efffae4f7---zazigajajegefusizavi.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/80562560602.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/23017842100.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/tilotojirodijuxipubudibag.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/78017942245.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be339ad7666---45559434135.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/49368607427.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607680a6782a5---3513178273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=memo+template+for+wordPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 16860 bytes
SHA-256: 5dd972ad09fad0aeb9e21e0e3de84dd1767c9d9e2678c9ad7c6fc410c35e3c06
font_02_sfnt_off00011a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A35 10376 bytes
SHA-256: f4b6fbf86fca5bedf90c809e1fef08407206be6d2e4f667b3387ce0606ac6158

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