Malicious PDF — malware analysis report

Static analysis result for SHA-256 524f684e3210a000…

MALICIOUS

PDF

85.8 KB Created: 2021-08-13 15:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb545693fd8ca683696a135307adc02d SHA-1: 8e717b2dffadc3f1f4e2845b87326bda6d5dfbd4 SHA-256: 524f684e3210a0000e43d087cb834d9aaf07cfce027bcc90def284755db71af6
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 link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a deliberate attempt to obscure the final destination through multiple redirects and compromised hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://perfecthospitals.com/ckfinder/userfiles/files/tuvoxekafekipujab.pdf In PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/d671fc442b543a55542dce5ce04b9c26/makipaboje.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/3ufgsd4b04i4ane3ej5cnklm0t/46155765253.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27a97c2604---38945564121.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/fikepidakupubuxelekotinaf.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/21010962690.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/30905646878.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078d1b69cc33---gugalijuk.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/23123976086.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/71127091578.pdfIn PDF document text
    • https://tigapilar.com/upload/files/puwubuk.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/fitupigeraxowunemafazafu.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f5a672734---dexijubetiretapuxubivazu.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/xowokanejutuvebelamexizif.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c225512f24e---wufawapukukud.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/nalivewirukekupameferu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/larajitifunuti.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608226bb3a780---32174286048.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/212370894.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e6f39733b---kikiwi.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bcd4f16d1---liruf.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/f6nr2l1vddp8bi962irtplieu8/sejarirakubu.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/34592947462.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/eb05bd0177060a0c44df72999a2ed807/pusubutogafebazowizutixej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=corel+draw+gratis+espa%C3%B1ol+portablePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 18316 bytes
SHA-256: b9d15ec5df902a09920309c8883d328e0070adb35a22351ab98f2703d4fbda86
font_02_sfnt_off00011760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11760 16204 bytes
SHA-256: 2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489
font_03_sfnt_off00012d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D13 10924 bytes
SHA-256: a4938dad95a11d28c676a330627525938856cbed8a14f33a2ed8efd31e5fba0e

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