Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5e101755e5434c…

MALICIOUS

PDF

84.1 KB Created: 2021-09-19 12:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6c8df68c4daa4049c5fe369204e60ce SHA-1: 831a6f3e09d3292f1a684c5ebd7292b7f8c7e127 SHA-256: be5e101755e5434cc63dffa3ad4a548d861830bcb2713164222ddb47707480c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to domains associated with link farms or compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://catamma.ru/uplcv?utm_term=dua+for+a+sick+person+to+get+better PDF link annotation
    • https://tennis-samara.ru/img/file/poririzove.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/renupeluxeximudute.pdfIn PDF document text
    • http://elsped.hu/files/file/31314476375.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/renamomim.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/nebunevalopifixakajaw.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161423503a7020---57974722847.pdfIn PDF document text
    • http://grimastone.ru/files/51885895832.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/90876534903.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/xoresefovekovavo.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/30550251988.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/masidalekisogewipujuwoda.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/putusufanivujakowofupujo.pdfIn PDF document text
    • http://skncn.com/u/files/98557899161.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/45681991141.pdfIn PDF document text
    • http://scpt.it/userfiles/files/gisukusega.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/57281425658.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/99639275348.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///40483396089.pdfIn PDF document text
    • http://metallpress.info/files/majovofakome.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/k9kfvf8cg5slae113g06904fp1/5269685035.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/navim.pdfIn PDF document text
    • http://parfumland.sk/upl/18048605246.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/jmdqounnbioetd03hd1mi9mau4/31983278587.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/jalep.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613164f23fe96---75507312550.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/90221896294.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_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 10944 bytes
SHA-256: 773bd976b5a928c15adebe5576c294213a837184c7ba034476eec94964d67752
font_01_sfnt_off0000f1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C5 22068 bytes
SHA-256: e30466d7c6c36f8d81b60c4d30b18a616d86e3328a89937fbea348542c9c64fc
font_02_sfnt_off00012a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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