Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b061457acb6110b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 01:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ca0acb9fa2047d842ac3e7eea7b3e498 SHA-1: 9b74232ce1ef49f13005a4600df40a7ad5421be0 SHA-256: 3b061457acb6110b61fb4d88fa215a3804ffb1a7c04473f6b3e3a4d8c44f6419
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting it's used to distribute phishing content or malware. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=magazine+design+pdf+free+download PDF link annotation
    • http://alanaf.ru/userfiles/files/gevavadipomujapu.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/10bce908d7106ffcc9c185fc2bf78dc1/jafosuw.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610062c30d01a---90294937824.pdfIn PDF document text
    • http://fitviewer.biz/files/file/17701884411.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/mutajepanepime.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/wofesojodadera.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/11965573545.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/39666086616.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddfa7b3933---91529587748.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/e136960a94e6fb1685101de08f645ea5/wesasa.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/cc1e0045fb828ceb8bf60ea7564a11d4/revivo.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/76918989212.pdfIn PDF document text
    • https://phr4u.com/files/dititotegojoludavuroma.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/9l4mgdfcg7tfs5qpvu681n8aas/wasidetejupinitapazafafij.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202106194347_636508776.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd1994d678---suzagovulenofozelidozudaj.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/30k9qq1kkbo168qsksi5m25a64/dawasamikek.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df9e478d715---27511524880.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bfef6f35c---relinevefizajuko.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202171814447969.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/daxudu.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/jekiwaxonubepuva.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/etbukk9v12f5vbq4egnt3dkuae/30543908188.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a675ba3918---16552022110.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_off0000d8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 17964 bytes
SHA-256: 70f6919179890c654c08f2baa5cb5f5168278403bf7cf70577235cb8a4ede6e2
font_02_sfnt_off00011f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F43 10712 bytes
SHA-256: 6b4c9d6c4a235866ec5d6292128ce2a1f375cb22014ec368f2b8558f8600cb3d