Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac5a047c98c6f0a…

MALICIOUS

PDF

70.8 KB Created: 2021-09-19 19:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 036b106d1d02b1a046e424fc7212495a SHA-1: f69bedb646df3adc02b4c4bbb274cf6c92829476 SHA-256: 9ac5a047c98c6f0a6b76f28856775cf3b97fe3e3e3c32ad7b17a6692419c2420
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains embedded JavaScript and numerous URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=msl+reader+apk PDF link annotation
    • http://recit-de-vie.fr/userfiles/file/dujototupaginizofovigep.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/1480238993.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/kewanulo.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/potokup.pdfIn PDF document text
    • https://coil.hk/upload/files/54154928520.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/7315694633.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/67563413300.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/vumiwalag.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/33889219438.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/46805374069.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/29942633585.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b07534b2e9---sufefatojudige.pdfIn PDF document text
    • http://peoplefoster.com/pliki/66500016902.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/eap9i3d2mslc3gcokdjuu9gjph/deragiduwupig.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613052ea249e7---24713072343.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/ninalupinagerejunotepe.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd0a96ec24---25748382476.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/07930bb8cc24b3929dc23d72468527fc/tamebufejafotipamezevupe.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/bololutozus.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/75530481956.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/79543a0dfdbb61bd51cec370dbfc9539/funegezubipedunal.pdfIn PDF document text
    • http://kisito.com/userfiles/file/49475118935.pdfIn PDF document text
    • 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_off0000b400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB400 16716 bytes
SHA-256: cec31b7495aa117ab4de62779c637e176ddb98fac419bb6ec1245e536b8c2b3b
font_01_sfnt_off0000df58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 10056 bytes
SHA-256: ac21f975aea1fac6b37ac6315e0d3fe4b9e48d5018496363b8abfadcd9c3a1e2

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