Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea679d77a95923bb…

MALICIOUS

PDF

84.5 KB Created: 2021-06-30 00:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d86d13a6347b1d72ce5a3de859328e02 SHA-1: 0c0b87f793312974157805023b26763fe267db08 SHA-256: ea679d77a95923bbf06e038e3b97d973de8243f8df19c01e318e20095d004c4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/udm0kt5kefe2apgp1th2b4cj74/26808314192.pdf In PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/d8cb0386abb7452ac61e493d574c6256/56329022817.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/001fb0160cc7847c67969f87393df573/7821875482.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/98ar7i5k3e9od437km097pmqhn/32791503722.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/84949056058.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/62196712919.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c25a1f2bce---64592417245.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/gel1koltj9n44d6qnkkpmpm5m3/nokuna.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/mofutiba.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/3d3296f820c534cb77d811cb5a7d5487/bomitawipazewuzuzes.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714bc2ad718---jobogo.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608308e07f561---ganiwedevoneroruxanutitan.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f437b5a6dc---81732529295.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/bafobevof.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/bufajasuzijena.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/gefireperixir.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/154280bb7364f4f456c6bafe13c7ebdd/rabatukejolobovigikasixaf.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/fce2d071de5c2b98d687d37237b75520/23247668397.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/87048395438.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e95f4319596b0936383e17a8a3dc9e9a/sizub.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/a1b836f4f9e9ec3f691638c2279f2229/nutiwozekanibafajobajaser.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dffc4498f---lenekejotidiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=holy+guide+pathfinderPDF 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_off0000e573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD85 17284 bytes
SHA-256: f0cca88dbb79b8e3295416f2d7f6a3b8c174e9cadb59e9fcebb40378f3410320
font_02_sfnt_off00012afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFD 10816 bytes
SHA-256: 5622de4b71fcab0d408046ae16735209d746fd8b511202c7f120a3ffc13c06bd

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