Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e5f5c2d8cc690fc…

MALICIOUS

PDF

99.6 KB Created: 2021-07-07 08:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 456ef1903c1d4c2232e70d31fe6cf9b7 SHA-1: df33cffea4b3404a5fbd4ccfae024108acb3a355 SHA-256: 0e5f5c2d8cc690fc6981a8917d9efe7e7b6dc8dab87716b92c869e4ae46f83d9
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan. It contains numerous external URIs and link farms hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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=formal+specification+in+software+engineering PDF link annotation
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93c2d245f---worumurafewetisu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160881f2ccc4f0---42876860378.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ukr9lrkh7upoh1s97f97jjbt14/12561949967.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/95813803986.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160827b72d1bdf---42209973805.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/42266157455.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160831e768ad31---xewukeza.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca21cca5d---lekabi.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607592bc53b68---9810054843.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/43514606033.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/mozomifemevajekobivizok.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7af2a94719---7297010271.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7f4261c4b---mekuziwitomut.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16074d1a901712---61797391935.pdfIn PDF document text
    • http://www.toptehnik.si/images/63868003935.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/46346043449.pdfIn PDF document text
    • http://myredm.ru/uploads/file/81272320649.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/jodebojul.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/ritaw.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/jager.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/a802ab4d974ecc7c8cdd0a803909475b/42597658815.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/xinupekebelotibidolasaka.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/ximudozaxojimifo.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/e7ec77aaba25d1ac1e7bc07c701ee103/buvibixelexiledujig.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_off00012023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12023 10888 bytes
SHA-256: bedd514c7cc9c324ea6efe66e1561feec776c8d862207e654f9ca47ee9622161
font_01_sfnt_off0001395e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15170 18516 bytes
SHA-256: 5619cbab06a3480cbc5e43e303ef2a11c8ce45378ee936171615ae730e9b7862

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