Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf668039d77739b9…

MALICIOUS

PDF

70.8 KB Created: 2021-09-29 06:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bed44b6e8d683693d69c566ba1ab70af SHA-1: 338bfb2e43ef467c410a26bbde6b0854ae5dbcce SHA-256: cf668039d77739b9f7abdfc43957be79d1efbccf17d4e1a5052956e2c8275ebb
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms or disposable domains. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

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://clair-environnement.eu/catalogue_dynamique/file/jiwuxozavor.pdf In PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/batot.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/79341683478.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8d1402064---32415348252.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/22390403615.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/zitakipuxix.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/64237566362.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/dutumobobagedi.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/21051989021.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/zizavipibewogomedexeke.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/debav.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/kiworomuzifit.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161524ebd96c40---dewadozujitenijemakizifi.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/80663947565.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/gimaviwen.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/09ffa2683c12a5c64f025e3faf19954b/43241918163.pdfIn PDF document text
    • http://catwalkexotique.com/userfiles/gubonoputebifowokofak.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/jegebogora.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/25319154740.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/zojokosiseratowamalanab.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/utspra6pj11q3rfpn2of7kvqqn/pogip.pdfIn PDF document text
    • https://kimansion.com/uploads/file/74378048041.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/93699854165.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/48006070569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=crazy+games+perfect+pianoPDF 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_off0000b2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CA 10984 bytes
SHA-256: 4db370a249742f9db60c237633b3aa61dfbef8f726921ab4d37fa6499e81f548
font_01_sfnt_off0000cc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC63 15728 bytes
SHA-256: cf45088546cfa8cab41d6c3e0520c4cf5fbf617bc2a1653d7777e3769d223949
font_02_sfnt_off0000f3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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