Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a6ccb564eb28cd…

MALICIOUS

PDF

78.1 KB Created: 2021-10-10 23:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 99fa973694ae1f3b117976a58950da30 SHA-1: d3479a977260600d6608fa023958b0a6a4261480 SHA-256: e7a6ccb564eb28cdc1d4a0f5f44b71b552ab2e41ac1234843b32e7be255d764a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the structure suggests a link farm designed to lure users to external sites.

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://chcial.ru/uplcv?utm_term=campgrounds+near+garden+of+the+gods PDF link annotation
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/htu6shltmt31qgmdso1hurjsv4/58801392733.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/vivusezonis.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/xidiseretuzarezebumixi.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/35559710074.pdfIn PDF document text
    • http://wawa757.com/uploads/files/3468924555.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/dipivavowetalosanoxu.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/94405052964.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/namize.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7f62c29da1d1773aec9da44ce1cf1a0a/21314298017.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/fefaporewupexul.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/35250247825.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/13023028413.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/43227424417.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/20524264844.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/zuxudokegufupiz.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/manumariketelebezater.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210909_F9F104C77642E77A.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615259365a8b9---gikiwizowuxuf.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/56976504550.pdfIn PDF document text
    • http://grimastone.ru/files/linusotewexupuxi.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/45471385867.pdfIn PDF document text
    • https://salwangurugram.com/files/foduzinexodelelub.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/50919169976.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_off0000cc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2F 17380 bytes
SHA-256: 2fb6a662a966428acf7d130ae1f6b69b32c0a4d119b19f17f84cc0b011aa14fa
font_01_sfnt_off0000f929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11140 10936 bytes
SHA-256: 0f98ace9155f8562725a7a23aee8843556b7d5f0c814c4a295cb17fd758059d6