Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f930fbf33de17e0…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 23:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 292f3c00d019eee31cdcecc2934aed6e SHA-1: 345a0e86e6efd88051f23c9d60eface0f553425f SHA-256: 6f930fbf33de17e076e1a8337469ed2eed88430750edbae6693f392d3ffecea0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to further malicious content. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to distribute malicious files or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa8c2f696---82904843531.pdf In PDF document text
    • https://sofupingame.net/calisma2/files/uploads/dusibazigakuwukijozakoj.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/rakinabaxoj.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161413069d1c5f---susubet.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/vepemeripepe.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/14900260746.pdfIn PDF document text
    • https://mots.alaxarxa.cat/cmsimple/images/file/kiwifatobumikare.pdfIn PDF document text
    • http://demkapi.com/resimler/files/ketamija.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/81917477439.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138cafe16c19---94195613921.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/83064008511.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/tirekisanazolitogog.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/55607245703.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210906115614.pdfIn PDF document text
    • https://webhosting4.net/media/file/komovojidipebufame.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/budizesuboz.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/58289670643.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/6737356405.pdfIn PDF document text
    • http://szpk.hu/_user/file/vuxovudutapoxiwimi.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/88830061374.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/tudogukogozifazom.pdfIn PDF document text
    • http://xtra360.net/campannas/file/riluxemoj.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/dukoxisadisuberaka.pdfIn PDF document text
    • http://leguido.net/files/puwiredejojedulivip.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/59000069244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+phone+locatorPDF 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_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 17620 bytes
SHA-256: f7ffaccfc98cd4f62eb79702138c59b2420ab485ff801786c1e9b1249e2cd352
font_01_sfnt_off00011598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11598 10424 bytes
SHA-256: c11ba8af40bcd3a8d3b4341ae4ea9b159eff1a6d6a6b4484b64499708cd63c3c
font_02_sfnt_off00012d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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