Malicious PDF — malware analysis report

Static analysis result for SHA-256 321b6c3f024cddf6…

MALICIOUS

PDF

113.7 KB Created: 2021-09-01 20:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b222aabbb2aebc1bdfa0f7da0093f051 SHA-1: d68c57bd918475a781f694c28ac92b88d3d3b9e8 SHA-256: 321b6c3f024cddf6033d9a2592aee66498eb8839f1fd7eb69b64929338902dbf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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.christianhouseshare.com.au/ckfinder/userfiles/files/wipovi.pdf In PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160fc162004c58---94262450305.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/78163334018.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/mopolunirokesubalape.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a08013deb72---pebagepub.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/93310862147.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c087bb523---64808901386.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/0kor852vokqlo0j8k5qmd52in3/zawobure.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608589b2e496b---vorigujuroxizafanujimozep.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/84b75227213988814fd9c71cfe384f8b/65371689188.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/42998153460.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/14943729907.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/zinuluvijajivibi.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/50136168491.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/2e4fb2b5a08c9e58086910adb9480592/garibilowobok.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/33073116391.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/tiliwenefekefaleretunar.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210803_084527.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161233c46a2c68---1313601116.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/dupef.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/r81ndp31ud4eb5el251b0vkto0/kudiw.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/78270952962.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a07e11627---48751598811.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/re04paip9da4anlrgegaihua7m/jevopajulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=concise+inorganic+chemistry+james+e+huheey+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_off00014d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D81 21940 bytes
SHA-256: 0f694c2e699ad9b59dcbe654dba2052e4801c25d467e2df539f6f042ccd5944d
font_01_sfnt_off0001864e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1864E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E65 11396 bytes
SHA-256: 6a9127dcdc09ab1bed0450e6badf55f5c81c9a45e17f5e93a865ac56da676e07

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