Malicious PDF — malware analysis report

Static analysis result for SHA-256 539555f73c0012b9…

MALICIOUS

PDF

69.7 KB Created: 2021-09-11 12:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a4d7641ba29a15a4d20d340891945c9 SHA-1: 158d50ca74491a6793c17f85c9666f12b93931ab SHA-256: 539555f73c0012b9415b83d39931229db96c05884b927dfa2d29ef583c6334ea
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content. The presence of a link farm on disposable hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21b6940a5---18611431226.pdf In PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/82391004694.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/79633682162.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/furagabuba.pdfIn PDF document text
    • http://zeci.nl/im/image/92220533180.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133c252d69a9---gudufuwurododegus.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/fiwagedisot.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/57184061252.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/xobarekuk.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/1otjc0ds7dcs57n8ii9s56amfl/47098985616.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210902_160400_1820.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/dakuvatarasarimopo.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/8694787004.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/86191576516.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/56289588634.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/67522748901.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5df8860294330325475f0c4eccfe7443/wenadovixotiwimivino.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16305030404943.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/xesumiwigutitaxaxe.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/rulisox.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/fejoleniz.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/704ph2ooccfsopb6e5mg42vr3l/70571272556.pdfIn PDF document text
    • https://funbugs.ie/files/file/50344193985.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/42000189834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pros+cons+social+mediaPDF 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_off0000b5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AF 14356 bytes
SHA-256: 00dd37ac94a2f9a03cf48d10fcf3880d9d4af6b71479dbc8471f62e0bb8462b6
font_01_sfnt_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 10436 bytes
SHA-256: c87086c0afccdca5aee8a453edb44582815ead4af9a63b6cfa6331ba2c8bb1d1
font_02_sfnt_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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