Malicious PDF — malware analysis report

Static analysis result for SHA-256 c436f38effdfa28e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 02:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d66332c8a6bdea2fa2841289728c3e5 SHA-1: 656a8e9d0019cc8504a98f54880e7b91342c7040 SHA-256: c436f38effdfa28eeaaf80b3c88b8215dfa17daa3693018eb0ed1cd3f8698e9e
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or downloads. The presence of an AcroForm button with an action trigger further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://crossfitbeeshark.ro/app/webroot/files/userfiles/files/56183837766.pdf In PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/44380875589.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/85422144471.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/36974211786.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/webaxojotomotasenu.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/43839461262.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210906030605279.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/44371900807.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/bizefovezewajibalivux.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/64850426953.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/12842544103.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/51119456524.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/xasutadapatazozep.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/muxokamumisusafefo.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364c5aa1e79---xopofekimege.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0d245002b0e471e9718cf09e2971ebb4/4267044125.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/64817874395.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/bafararigusuvizipumulomaz.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/48955053852.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/sowivuji.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ic2pp1quikt7asun4341k812do/kavin.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/17768557151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=watch+dogs+2+ppsspp+android+downloadPDF 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_off0000da64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA64 10860 bytes
SHA-256: 0dd546eac7d32f47fc1f1a3cca200888a931202b60d68020bab0692270d09f9c
font_01_sfnt_off0000f355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 18204 bytes
SHA-256: 131593e4ad61ed8b733655663f4e39f0d51c71b162ad6efb69b7fe719f7fc9e3
font_02_sfnt_off00012358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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