Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ad3d6d3785ff5e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 20:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2ae0f1f9172fa9c4f73cab8d7e970956 SHA-1: bdc05074095b62083768a4f56d921d73cdc3a3fa SHA-256: 43ad3d6d3785ff5e0bf93e0b9d0493ea5e7ad4d9db0f401227b5e1faf0dfe531
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/lelubif.pdf In PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/vopipotuwoludojupamun.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/57516473332.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210615_D45102ADAAA4F247.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/3007ef7c5d51bda1ff6b9bafb9284d8a/79000402498.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/66608641977.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/c2f8b3e540fe2eff8139e85050a62dd8/77039698289.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/78476687124.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5e32b462c---xenijumoturewut.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/sajozid.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/81061323235.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/10618733427.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/goraxuzurekosixebonigaw.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/walepinubafazefizexapafav.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/warijepafazutabo.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/glr23l6bo03jfeh46qfqgp9eqj/lexazov.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/2882017713.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/74151773374.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607866dec2835---88692506815.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078a69c564aa---vazuwipefewatukasowerigu.pdfIn PDF document text
    • http://yoron.net/up/files/gipotiwerutakutizinopi.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609319aee3a76---gopumijipilunute.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/96533220707.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62381109965.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/podavu.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/susewilogivofozulumedut.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/44694604135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=swipe+right+levi+lusko+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_off0000df08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 10928 bytes
SHA-256: b8910345e9c106d8b645eec48c85f0bf498a144e2d7842622180a185a5bf6e72
font_01_sfnt_off0000f855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11067 18480 bytes
SHA-256: 7cdb514dc018716ecb93fd240ddec7ddea09a9a3ac9ed2d2700c78402380c87c

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