Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1095f99782addcd…

MALICIOUS

PDF

77.3 KB Created: 2021-08-06 09:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d53455956d7af4d72c451484bc160d8a SHA-1: 39de0dc5e0cd777d0961410b3f8b4025e00596ad SHA-256: b1095f99782addcdd1c0b1c35f06b2fd09399719a50e134baa8ccf2a01253d4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to external sites hosted on compromised WordPress installations or disposable domains, suggesting a phishing or scamming attempt. The presence of a link farm on potentially compromised infrastructure is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://olsztyntransportmedyczny.pl/userfiles/file/70866388265.pdf In PDF document text
    • http://forter.vn/hinhanh/file/23433541012.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fde5e6aebfd---24098892105.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/nunubuxe.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/7u3cm16mevdc3mq5k0crbgisgb/weliboxujidakalenux.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/6ev2d3l8hroreu0km8h0eifr1c/kumawolezorokosi.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/82246732365.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/borininemupifepageki.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe832b1c56---79609572550.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/mjag7730ei9idqjur36o1si0hq/rawikusabuxan.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/woludinox.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/73707812744.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778e30c4809---kuxewilunisevabono.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/zasejojidumogim.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/edd250333f7d52b0d998d18e3565098a/6093856669.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/96617911965.pdfIn PDF document text
    • http://unsersohn.com/images/file/75998019476.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080b100bb05f---nunejev.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/54739758488.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079d729517bc---kadafejo.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/mexuwe.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/51620242152.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bddd01c033---wizixikiravonaxeb.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ce17a451---55955639319.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081ad0996f3e---lojeleliguguwetowunofolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=imagenes+de+manualidades+navide%C3%B1as+en+foami+con+moldesPDF 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_off0000c7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D8 16844 bytes
SHA-256: 220413e9137131922d959617d92c9f3e917cf4d105e155bc2182c961c0416f46
font_01_sfnt_off0000f3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEC 10944 bytes
SHA-256: af90dc5bedec6e9c05510f9d51edec863cc2336cc4e8d6e81f053124ac0468fc