Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f32c3992e2f6e59…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 03:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 41f36c331e1e23fcd76dd6abe9a0166a SHA-1: 54560a9d7e9f1649cbeed2d50d3a63238967fce7 SHA-256: 8f32c3992e2f6e595d88a990bb47c137b6116e8db615bb3af743a9bf4b3ba5f2
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://fenixfalt.com/userfiles/file/80681910197.pdf In PDF document text
    • http://ajtoablakcentrum.com/_user/file/misega.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/74554742965.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/sawufuzobekibexukokuwazi.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/fibijifupujanuxik.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160898a70062de---22012657112.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/tuvafabodasipijo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609203b6ef936---89399902647.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/pobewize.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/tafimirale.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/lerulomisofo.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/lopekiwisitawazoxuxev.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877654eb014---xidomolofarig.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/77373342810.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95499dd7e6---8697514674.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/zajidosawaz.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/e10b4ffd2def42e10f47e95de36d3d0a/gidupijuwonikoperebe.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/67235025944.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b376ee63a6---51259657912.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/dizokekajizugapaxame.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/74359582102.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc375941bf---zedurizezezabuwijax.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2dea95f62---13216673342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=on+writing+well+william+zinsser+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_off0000dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 10892 bytes
SHA-256: 7488e2306b2553545d71165b52e9a562a66dbe13e3fd06eddc9e47a883b8fc83
font_01_sfnt_off0000f61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2C 18648 bytes
SHA-256: 246773c2c9ed985a50dcac547cb518f72ae046470de7684e59791acc02474b9a

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