Malicious PDF — malware analysis report

Static analysis result for SHA-256 f580f339926635fa…

MALICIOUS

PDF

74.0 KB Created: 2021-07-01 15:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8c46eb96f955c28df329acb987352b2a SHA-1: 480bc706998ea1727ddba32db449ebe7f0adb424 SHA-256: f580f339926635fa08eee61544536b29d45f7686f8076cdc1fa2e9dc15b744f7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URLs are indicative of a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://crysiq.ru/uplcv?utm_term=fim+levels+of+assistance PDF link annotation
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/84811023850.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/gazamigox.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/50910657836.pdfIn PDF document text
    • http://recrute.fr/files/files/19544064468.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/potaneli.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c28d4bbfa---50681842358.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/0df4502bbca0d64b1da149b63416099c/42446338185.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/f6c416fe6b86737741387530fe4f2133/gikimavejisoda.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/vurakenudu.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/86382253926.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be1968ceb3---lezolaxaz.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/50066203732.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ff5908c65---88298232927.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/24338844796.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/7vouurkc65ronko2s8pj8kfaba/kawafudubilukuwugipitu.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/tobakubivilawidupu.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/gepirusegov.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/sozezolikotora.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fda53c9e2---8439092003.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/ed7a4f2068211698360b831ece82d792/9843104194.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091d8291edd8---40676834088.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/47c6ea6917ead9ee4cb4c903859171ae/juzaseluka.pdfIn PDF document text
    • https://estoniapools.com/contents//files/31138449435.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_off0000be33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE33 10440 bytes
SHA-256: 02e9850e41125792d4cd140a5c9d70e8dfa1c7cc8cec255fd1cdba3b1eca88c5
font_01_sfnt_off0000d5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E6 16552 bytes
SHA-256: 545d40a6409a2eb4112a77242eebfa320c8a3d6a19401988400ef77046e65057
font_02_sfnt_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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