Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd41be73d5327d2…

MALICIOUS

PDF

83.0 KB Created: 2021-08-30 10:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 816cbb5c11e350e4c4fd6c400603a4b2 SHA-1: bdcd4283e94c495041b8b5a7fdc8f404b7aef6cf SHA-256: 3dd41be73d5327d20a2060163c4edff34787ed9684349c58603981c23effc447
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://sahrugs.com/userfiles/file/nepakuwuvopizizekoge.pdf In PDF document text
    • http://fine-cottage.ru/userfiles/files/38941826176.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/4668718652.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vk143ompaqa9sn9k7df9qksn33/54542780295.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/85ff5b0867989ba59f194e58a5c04e1b/29255041604.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/venomemupidoritamoruti.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/96707287005.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801c0e38731---dufatesozaz.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af984354fce---59316663489.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/nupegunakexevafimizuf.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/kubozagexe.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/ronuluxinorudaren.pdfIn PDF document text
    • http://thongthien.vn/upload/files/20006992555.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/75597681786.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160922e36ee437---70527903704.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/golukiwof.pdfIn PDF document text
    • http://infracsap.hu/files/file/getovuxalitadola.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843146ea27d---30082836108.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ea3cf40aa053746552a6998f65e49b8d/55318422336.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16097dd3010512---86775281401.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210716022341_m5g8pp.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/relenezefegovuwigit.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/vuferujaxigafo.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/24561571601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=string+or+binary+data+will+be+truncatedPDF 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_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60E 17904 bytes
SHA-256: 3cbf1eda2c901465c7476b8a99af928e8a96433ade76970a75453d6adad6127f
font_02_sfnt_off00012517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12517 10892 bytes
SHA-256: d0cc3123fc66fe2994b317ae372c848b7dcdb151fc046247b1ba9501603b013e

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