Malicious PDF — malware analysis report

Static analysis result for SHA-256 346f479ecb97fc9d…

MALICIOUS

PDF

86.8 KB Created: 2021-09-03 08:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 02cf7b2a28244ad20176431c96cfa363 SHA-1: 1b380836728559310d4e859163f5b5b8a744051b SHA-256: 346f479ecb97fc9d3ee183e16dec281724402adc27e317d7b5293c0493c79976
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting it is designed to redirect users to malicious sites. The presence of a link farm indicates an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=cognitive+neuroscience+the+biology+of+the+mind+gazzaniga+pdf+download PDF link annotation
    • http://toyotarent.kr/FileData/ckfinder/files/20210824_9F3D1A8DDF32A3AC.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/eac1046b04392cad155c3491c7c19a15/58113310896.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/e2cd3d3f75bc202bcdde7c00fd509b3f/komugegige.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d86cbaa1433---51353929663.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3bc30a41a---58701089246.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/82478064904.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/bepukex.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/f18e72450fa31e2814580a453cf00ba3/nafazofaxarugevadewin.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/dotaxijakifilajobuzaresa.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/javiludedumosemafedoxizi.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/u3shvtgrd0vbn1gb8t18husus6/67982534469.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/83177514778.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cee5d5d2c---76954520578.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d081187e01---xexiwakegule.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/74587776425.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202107231721537276.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/bopixijewiwabemilifu.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/21f41dd50455d748678a942739658f4c/87143923162.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b7b9ad824---95282260667.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d9245dbb---vonofusajog.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/50656962752.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/38f878da2ce28acc9fe1e6c6cba57e54/30993486663.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/0m9a72led6qq3nqt47pa5na1t9/fosovinajefatidelomefe.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_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 19972 bytes
SHA-256: 3fb770a27ac32cf7cc96bb805371fbd954586c6d3cf2a036141cfa836858f737
font_01_sfnt_off00011976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001318d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318D 11664 bytes
SHA-256: 71bc7db730c8a8f5c8b2b0f39b97979fee505cbb26bb013793d55f7014247717

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