Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae3d1f0f51e9a4d…

MALICIOUS

PDF

78.1 KB Created: 2021-09-05 16:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: df1b24d7dc792ec28f6f806f4703e544 SHA-1: 763bde8ba9f8f36c9444a1bcb80234f038a5525a SHA-256: bae3d1f0f51e9a4dcdaafda893586639f54c05a1ef2557502b048653e80f4c6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristic findings are sufficient to determine its nature as a malicious link farm.

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 http://pinzimoniofiumicino.eu/userfiles/files/rabajepofisewob.pdf In PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f8ee1be35---dokewawaver.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ebd1041e6---80805433638.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/7502030725.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/gorezilanumufurizut.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/doregujolekenimaf.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/xubapifokax.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/90546466523.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/04iut9b6kodthqeod8p85vth6a/62618943744.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/8ov0nii66qbf15kf9f0tvbfr9o/16433376312.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/88222260317.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/jawawijunusokuxod.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/fepevu.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/843478bc0f58cf770450a1a0ecdcc832/zidipotixemubajilud.pdfIn PDF document text
    • http://foxadv.net/file/80911197548.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/r9uqotggcv94e9chrhhqrgpn4q/wodijezozo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd93765adb---jonivekilolejudojazane.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210609092909.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b167361cff---21787225144.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/81260174524.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/66131686786.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/5paoja5i862d04spbp7avvtd8p/lodokiv.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d8eb3c45d---nesujonugutegoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=rudolf+steiner+carti+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_off0000cbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB2 17916 bytes
SHA-256: 3859f2408baa33a5af72f247260787a9ef482261887c51e2191e54092d0e98a9
font_01_sfnt_off0000f9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DB 10756 bytes
SHA-256: 72a5f33eee4c4772926ba9072469f0e6f7d38662ab6fcc115ad09281e1fa9a6c
font_02_sfnt_off000112b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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