Malicious PDF — malware analysis report

Static analysis result for SHA-256 1acf9decda416104…

MALICIOUS

PDF

157.4 KB Created: 2021-07-26 02:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 91d46838d2473b143500da4597f9e5bf SHA-1: d021eaf640d4be2be3357c3a72cff0c9770254ae SHA-256: 1acf9decda416104c410aedd7acfa75ec6554e04c5acca37d2881290f61c4468
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external websites, many hosted on disposable or compromised domains. This pattern is commonly used for phishing or distributing further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://rolmech-strzelno.pl/Upload/file/1204401251.pdf In PDF document text
    • https://tedvandergulik.nl/userimages/file/32142849849.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/pigilunudisuku.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c196e715744---liwazokezewexum.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a65a5cce62b---zowukuwexesopuxisok.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/53e6ac80dfab7ac5bd78a0b0e85fed5c/sajawifagagon.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/886691be3c256b234c7246abf77597be/tarupegoboropewexodofak.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6def612b06915c2b730595c8194f8b01/57417550645.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073afa04e9a3---kekuralorer.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/51316548953.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/sugemeduzawogoziwawelow.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/70957189717.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/80426368224.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/tufemejesuxojisimeted.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/domavolipatorumulolozas.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/rukefulolugulifovovux.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/97a74f0ed9daf6172f4625619aca9ba4/84315900025.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/837300689c0e1a9a88c8cd3ebaefe895/80047467435.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/sesositorulesakokavomamak.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/25256167840.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083741b0565f---33734738677.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/tepedogepirexova.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c210659ea---vawuraz.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/2fbf9c51226fe6d26687d037cb68e2ff/xenute.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/sizarup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=plantillas+de+menu+mexicano+para+editar+en+word+gratisPDF 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_off0001fca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000214bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x214BD 11148 bytes
SHA-256: bd093181ebe98d3a9be8e5addee108631dc96be67003240ae7bd3a7ea9581f49
font_02_sfnt_off00022e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E9C 22044 bytes
SHA-256: c66cce55d5def504ff81ae10f766ebbba9388575518edd6ac3fa7b9c8763f02c

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