Malicious PDF — malware analysis report

Static analysis result for SHA-256 543264c40b7b60da…

MALICIOUS

PDF

94.4 KB Created: 2021-09-04 14:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1109fd7dd40cf1ba325e9f21ccef75d1 SHA-1: c0997f9b9fb232c692befb3280e5be208a08913e SHA-256: 543264c40b7b60daa669c21380324c79f122a7ae37c14c1eba14fd524659752e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a20edd321---77624576884.pdf In PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607096a24b31a---36415684043.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/22350026682.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/dasidorir.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/fehbq51ju9t5btqhv5geqaok6l/xuliwuxufonubibomej.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/zazomolugumuwonukarag.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/td5rfam5d0g794qvl983vgvns7/98082070697.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/kubon.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f83821ab35ac64f31d5b118a3511f812/80525443598.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/danazevoxagasotogejide.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210802083127_giehr4.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace94e468ef---ninekerajupipoluwebugim.pdfIn PDF document text
    • https://www.disbel.es//ckfinder/userfiles/files/15431105172.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/7nkjilova21hd9klrh2b2mmqt9/jobolozugigux.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/86570027256.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/16665481074.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/5ac300297359c61731c09d07a3303d6c/xutezolebej.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/24316190778.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/povowati.pdfIn PDF document text
    • http://otczenacts.com/media/files/niwerubeluzedofobuvuj.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/2560740bf088df54a55b3a2cd04f2f93/90322849474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=oracle+10g+pl+sql+tutorial+pdf+free+downloadPDF 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_off000108df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DF 18568 bytes
SHA-256: 212eb9d528bf8918ac14975693989f7bee8f1aef62268d808af4b6b4bc99b555
font_01_sfnt_off0001395a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15171 11328 bytes
SHA-256: b014d30adc7f63a3f9556ac6645e4039aa9bc7587984eb5d8eaafd84df1973e9

Open this report in the interactive analyzer, or submit your own file for analysis.