Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5b460d08c4b22b…

MALICIOUS

PDF

83.3 KB Created: 2021-08-20 01:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ed8e47ea706296c64938d418da0384b SHA-1: 7718de2b8cce123821efdaa316cc4cc776b61d4c SHA-256: 5b5b460d08c4b22b7824c9e9de8975c1012e9366ab40c7d13efe97565aeef0af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farms suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://laborke.ru/uplcv?utm_term=how+to+use+proform+without+ifit PDF link annotation
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/f21olnc3ko3kj7ectcbta91fut/34857849080.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/90647662413.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/88788b8b394ccfc595752fb40069833d/26154479236.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/51990545547.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/57978146511.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117aa7b26a63---81470539165.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/suxelefidojoserebapox.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/69392949061.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caa649b4eba---83043607172.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/zutaxuluwowejonudopi.pdfIn PDF document text
    • http://elijahlaurabishopblack.com/clients/b/be/bed082b287f5bb70db4763ab929fc18a/File/60572060598.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/6bcf6ed25f719040557cb2ff08971083/79803912978.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/galafab.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e4ddbcbb330fc67bf360fd55a1e4448e/mejujufor.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0ac77ee01---84129557701.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609baebeabc4d---3218773672.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec537a4bab0---49903094421.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/ponuvixuj.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/74468727390.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/jivibigoberozewowoxotibiv.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/f9105f52c9521851a60853c27a1b1f02/namudex.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/73084214983.pdfIn PDF document text
    • https://eurocomm-italia.com/file/31443001038.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_off0000e0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A0 10488 bytes
SHA-256: eccfb4a9dae1d45c8bc4d08f5b726cf96aa321bb370811438935593e18f94a15
font_01_sfnt_off0000f884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11096 17144 bytes
SHA-256: 51df7de67a56ffe03ffd83cb0f82a99f460638ec76bcae68655dbcfe8176e176

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