Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3b8ea6e0c40271…

MALICIOUS

PDF

82.0 KB Created: 2021-08-09 07:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c9750556e805f874186bd60bd6f6e6fe SHA-1: ba7e205088e6ed2fb189b851d0f5586b2b01ac43 SHA-256: ff3b8ea6e0c40271af2e6a23e33efdd79234c17efdc02db3d59b5d238fd587a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to various compromised or disposable hosting sites, one of which is explicitly linked to a 'microsoft office 2016 free download' lure. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://softtox.com/new/userfiles/file/10412462225.pdf In PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/eifgbah79u4vnfij3s79ab4us3/7447128946.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16094570ae3599---49858006316.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160885e4388302---gawifijifujiten.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/a57f00c4268fa42f92e99a861b9aca69/zefulukemixudax.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/54224149955.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/vobozirefudalajogitin.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/mimejesab.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/rufamevofas.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/suvopujukufafirerol.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ca37e98640ef234d4573a6d0f4362180/kimelara.pdfIn PDF document text
    • http://birudongker.com/contents//files/34997279547.pdfIn PDF document text
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/36096897830.pdfIn PDF document text
    • https://soechi.com/userfiles/file/75356719087.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16075a82c11d09---vopovukit.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/57455153278.pdfIn PDF document text
    • http://axwelindia.com/uploads/fonapojixo.pdfIn PDF document text
    • https://lesura.net/userfiles/file/jajirifuteber.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/4575969287.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/fifagupomosupusapa.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///daxajiduzixitemixaz.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/7f2ca017cdd29ea4611cad222e8d9866/18592254816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=microsoft+office+2016+free+download+for+windows+7+32+bit+offlinePDF 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_off0000dac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 11372 bytes
SHA-256: e43ecd8cd0cdce2386e936d95e1b8bb1dd6019723f3356e657c0f997ee2a2632
font_02_sfnt_off00010e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 16360 bytes
SHA-256: ff666cb13a0483eefa326b6966a5d704353c4adfb5d9339ea4659ff69d4a052a

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