Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0d716a7621144b…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 00:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a132b3c7e25681f714f30b423bec5794 SHA-1: 3beff7790a63c0ea8ac5355e2588cc41c84d6648 SHA-256: 1c0d716a7621144be06893d192cd708fc51d9f7c899dbc35d4457263c950f96e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, likely intended to lure users to malicious sites for phishing or malware downloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://krisoc.ru/uplcv?utm_term=female+empowerment+blogs PDF link annotation
    • http://offerparts.com/upload/files/73611436318.pdfIn PDF document text
    • http://mylodge-naoshima.com/33669846686.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/14089370975.pdfIn PDF document text
    • http://expresskaliski.info/file/17714078003.pdfIn PDF document text
    • http://chenruichem.com/upload/files/zixesutatizabebulowaji.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/71958818426.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/tafavubiwozoxu.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/39240230663.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/74652261853.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/dunejedosu.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/67640910444.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/kekojin.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/voditi.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/xorajomosuzutudeg.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416a53591de---somutemadomatagidamosaw.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/debojipoz.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/mikitoraletenu.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161335c828572c---58407059064.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/lugugusa.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/31381756832.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/13375806353.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd3a8ddf6---zitisuropidepoxena.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/51114468612.pdfIn PDF document text
    • 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_off0000d0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DA 10708 bytes
SHA-256: 71fbf5f6fcaf925777e90c28970303ce3c003c9690b3177b38af19b3c802ed29
font_01_sfnt_off0000e943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 17292 bytes
SHA-256: bf6d8528a5b50eb5e03a4c5be88c06147827acc3bdcb8719afb11144c1a73711
font_02_sfnt_off00011684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1