Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ee05073de80869…

MALICIOUS

PDF

108.7 KB Created: 2021-09-01 11:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 875e8b41deea2c5e9729037b15748550 SHA-1: 4390565c00c0e99dba4b7a5e1374b74b4f94b714 SHA-256: 68ee05073de80869b6158e091df18ca7523abfbd00845cb39119945760676771
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories and disposable hosting domains, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate maliciousness, classifying it as a phishing trojan. The primary attack pattern involves luring users to these external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/e3875e04ce4bed60f021b70e6f43bf68/voxiwafelubibi.pdf In PDF document text
    • http://kashima.cc/userfiles/file/52212876349.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210824_DB55AE93C7C49262.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/64321753580.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/xevikutumemuxo.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/95351032001.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/7088231306.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcec65571f---vefumetigam.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/volixuliseboxorip.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/34245643972.pdfIn PDF document text
    • http://myqself.com/upload/files/44094447926.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/70308569342.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d6792303b36---20242697622.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/dalatikuguwumo.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160972bf9b4564---xozapele.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/12535771376.pdfIn PDF document text
    • https://whitesal.com/data/images/file/4969_20210730184810.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/dcf5fd9c6012df842f6e9715d889e010/lolototojesos.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16118f7d199ffb---pukus.pdfIn PDF document text
    • http://dentherapia.hu/files/file/pawigoxelidufevelisas.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/tazavevizajetar.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/572452a99e59cf500076c2a17662b658/2413967910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=100+pin+bowling+wiiPDF 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_off00014532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14532 10072 bytes
SHA-256: 6ffe4020ae0fd5cc6005d2cc83ea299805467cb975699da73e8010fd18d44001
font_01_sfnt_off00015b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17383 19256 bytes
SHA-256: aedf64f755c0810908dfbdf7940409151229cfdeb707521920748ecd67096059

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