Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e98a82dfcdf198f…

MALICIOUS

PDF

112.3 KB Created: 2021-09-07 08:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75d6f3ecdf0e7bf91a0fd2d461215245 SHA-1: df8b35815b8aa17eb3f97b904817cdfd76ac8028 SHA-256: 3e98a82dfcdf198f79d616ad8b3090b70b756a6c3768fa71305df6234ca065d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress upload storage. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user, likely as part of a phishing campaign. The document body was unreadable, but the heuristics and URLs strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://bestbuyfromindia.com/userfiles/file/77770291372.pdf In PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdaf7ce7e2---96092516521.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/p0lk1bh4uksbi6ovfgg3qe081f/sototowijuzox.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d0feee6d9695514ff41e18b0eefb540e/8451762818.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105eec79f968---67470794190.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301f8b6731a---pivobawawotudupuzomufofed.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/28602930411.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161131396dc53c---lunubalegonosureta.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/16681084496.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/dfda9be62d7fd8c0a97529b2c72c8f86/zebagonozabimegakodul.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/pufagilugijinasif.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/d2fb13daf49ea654240f4d5a5c16671d/tedexusisosovabuk.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69520e37c---zinuviwo.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/82076088567.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/xukeloliximili.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/cbc5751200c306ecc208ccedb35421e9/79044154835.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81c0al3m50fqpjqtu5quat16d3/27608654689.pdfIn PDF document text
    • https://sharenkon.com/files/nezanawebowutuwawilofaso.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/14d9vhos63a65b6enb4vqhndm7/18100857341.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/vewutoxizuvukomu.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e4ab67651f5---rumumivaguzizupepojet.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a501f82c3b2---xivudasabibawanimenenati.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/nonogizafovigabifabo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5d4f1d0ca---vijuwifudoxarirag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=intermediate+accounting+ifrs+edition+third+edition+pdfPDF 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_off0001518f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1518F 11072 bytes
SHA-256: 57b2fd36b665ccecc6904fd8dbf2f6115459efbd38092868efeef82db1a0933d
font_01_sfnt_off00016af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AF6 18724 bytes
SHA-256: fcd57bf030704ef4e181af60c77347e79a1e48fb28608077100453a635a13685
font_02_sfnt_off00019a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1