Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5762d4939f1e847…

MALICIOUS

PDF

68.9 KB Created: 2021-09-30 15:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 71e558f95aceb56afb4498426fff27c5 SHA-1: ead36256b80d1bc8b7dc78f762073618be991b85 SHA-256: d5762d4939f1e8472da669ce2037d4f8bd1259a1288a607aaf73e0698af47e5d
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, some of which host further PDF files. This suggests a multi-stage attack, likely initiated via spearphishing, aiming to exploit vulnerabilities or deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://khanoomhoteli.com/basefile/khanoomhotelicom/files/59604625905.pdf In PDF document text
    • http://koala-al.com/d/files/jogulituvaj.pdfIn PDF document text
    • http://nprofit.hk/userfiles/88442218047.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378a0cb898e---sifomosiboleti.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/zezoteziradukex.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/96440244248.pdfIn PDF document text
    • http://thevalleytrader.com/files/moxiburo.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/nuvufuki.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/nuginerobofim.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/xilavamupunikipa.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161337199c441a---68092998729.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/zabagig.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/20937809948.pdfIn PDF document text
    • http://scsytech.com/upload/files/tojabi.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/kozib.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/50664166268.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/34637238835.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/32741236564.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/82322754834.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/4469410021.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a210e1909---funelusobonibagegikuniwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=adaptive+brightness+androidPDF 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_off0000af6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77D 15116 bytes
SHA-256: afd02f86c6c10b84a7abf73775e75de6dd34b0be3dc1d366cb51121e1a9b9a40
font_02_sfnt_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 10812 bytes
SHA-256: 16cec4bd3090f9dd704e3b63fb1bfde46131e6db637c67d71b13275faa810b33