Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd44be5b3fb30f71…

MALICIOUS

PDF

71.8 KB Created: 2021-09-23 12:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b0dbf78c14174f9b5dac010d7991a481 SHA-1: c9d4d8386fbf42b2a98336171754d013838c4129 SHA-256: cd44be5b3fb30f71fa0160c3a47fba950d6a115d5a591b094d3a4b03cfc886ee
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. Multiple heuristics indicate the PDF contains a link farm pointing to compromised websites, including one using an IP address. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://orthocarecentroortopedico.it/userfiles/files/kazef.pdf In PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/7d249205095334ddbf0f04c42b2cd33c/42710446728.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421cc427771---bowilubumixotezagodaveras.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/25543972429.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/wimafaxixuvolekezuma.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/76079531786.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/rutisutiwema.pdfPDF link annotation
    • http://kibbkw.com/uploads/files/81079573074.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb4c9d33d4---faduzigowuzapujax.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/pipuxafujugi.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/fovapifetujigu.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/jovaxepe.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/zadaluwi.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/xogepij.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/webunarobawak.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/92803495738.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/37524247341.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/0fa7e985fb0fe7821170b97ab79fab30/91049451173.pdfIn PDF document text
    • http://mobil-tech.com/files/bijinoko.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/neserujanagerinoxakure.pdfIn PDF document text
    • http://koutingchina.com/upload/files/60742056749.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/99923019424.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365fcb1679c---letepuriwulafave.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/resakoborojirovido.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/7184112743.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/vaxuwidaxet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cyberlink+powerdirector+apk+proPDF 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_off0000b8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A8 15756 bytes
SHA-256: 5d03e5f8de5e422d036f5f4c5aaef3d728511900705969635a69cee5f7c2a1b4
font_01_sfnt_off0000e084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 10804 bytes
SHA-256: d8d1e6daf3333311cbd2ac41b943c78abdf13b3fd1ac5b352181dbc21db2820e

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