Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f85ce9fe2bb06d…

MALICIOUS

PDF

90.7 KB Created: 2021-10-25 10:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b9b6b7c75f871a0ea630f1ee2db66ecb SHA-1: bffe14c2e70aab57b2b8f12b0db36cbc69aa37b9 SHA-256: 84f85ce9fe2bb06d69b1fb1f5976a37b47234b4180343f38fba81073c7b1da44
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple external URLs, some hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or manipulate search engine results. The presence of numerous unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.sterlingsez.com/ckfinder/userfiles/files/25376280444.pdf In PDF document text
    • https://oncetrabzon.com/resimler/files/29551128530.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/897sjagkppsk983bmc64fr7r62/52560940746.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614da6d92c2fa---fonekojuteveta.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/82143112967.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/53307813523.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/64017944101.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/91034965834.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/zepuxiniduzubaluxomuj.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/6340752587.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///78181643768.pdfIn PDF document text
    • http://bscartridge.com/pic/sofizu.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/sorumikosidonisefof.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/gifujujujunorafuwix.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/surulaxukefojaxodakiwinez.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613564c52fd7b---63367928123.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/84162681639.pdfIn PDF document text
    • https://advik.net/userfiles/file/pavenofomudogadelubo.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161698357b5320---koneresipi.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/zigemimepuruzazarezegajox.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/lusimifej.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210901081825.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/zonepodatotosemu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/EqozwcbAC44/uplcv?utm_term=how+to+make+mushrooms+grow+minecraftPDF 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_off0000fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 18808 bytes
SHA-256: 79046c2093b55970357e8fcb4e601a4fbe08c87d59599887fbe7424243022e3f
font_01_sfnt_off00012ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA3 11004 bytes
SHA-256: 9c5b2543614a701f9ac3fed98a7773ba679b0c49cefb089eb5d68633ce093292
font_02_sfnt_off00014513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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