Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d688bb5f958b9a4…

MALICIOUS

PDF

75.1 KB Created: 2021-09-05 09:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1a69bf1eb205ed9021c7b4092c282f19 SHA-1: abb6d723443040a2c1c2741e9db0f184d06e340a SHA-256: 0d688bb5f958b9a4c53f9d58ba07d925876b0cb6f270481167ed0a26fec18df9
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ayhancevik.com/images_upload/files/22524097968.pdf In PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608150f9a8554---22339134838.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94981055937.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/68206758786.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16094533a793a6---76628754197.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b551b195346---93167665438.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/18374835889.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/vozipipi.pdfIn PDF document text
    • http://ipublicity.cz/data/file/391385408.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e6918c623a4---podukusaz.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/maxumijowoxufa.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/garovu.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9c176f60c---saxupinosupitidunojekode.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/78844175001.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/gufimefekepogotidulifokov.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/77322351388.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/22944031115.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1627252289586575516.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abef215ed05---41510115477.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/50669109542.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/76344934173.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbae066092a---58424320869.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/55623291284.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/supesesetisumokab.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/5df749aa81d997e6b33bd21d0b025a22/6164449628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=standard+costing+vs+budgetary+control+pdfPDF 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_off0000c457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC457 15508 bytes
SHA-256: b19cb2ffac9d57d985436e23c5a2010c525223474942fad36b94fef59c7071c3
font_01_sfnt_off0000ebc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 11288 bytes
SHA-256: 101c83abb7850cfee0011a33ba3f3a3784fd0881ea81d0acf1dff49213160844
font_02_sfnt_off00010605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1