Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ab7cb70ff2442e…

MALICIOUS

PDF

79.4 KB Created: 2021-06-10 16:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b18f21c12d10c0f38d0b747b15bf57ca SHA-1: aa4f72e7a9bbdc115cc7505bc35c3675fea765ed SHA-256: 63ab7cb70ff2442ed0b98ce8dc58df3c12b1b94c7285ec56dd654a154eeaf874
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document functions as a link farm, directing users to various external sites, some of which are hosted on compromised WordPress installations. The presence of a 'download' button lure suggests an attempt to trick users into downloading further malicious content. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=gta+5+files+for+ppsspp+gold PDF link annotation
    • https://gastriklandsbf.se/UserFiles/files/22345539680.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc106210b9---39496493569.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/1f3ebf538037e0bbc8799c149dde78ea/86396291625.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/54f2744e9f5de9590d403dc5e5bb635b/gutabo.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d586458816---tebodazi.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/83939723517.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812908c1d07---10518442725.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/rimedaxapesimobazefo.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b65818924---zejelefumezef.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/86655739881.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/22203819b790ea557666fbed2fb201f8/38045249748.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087df30c1cc1---zazovarademafoparo.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/sasesado.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/miles.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16080acee0f7a4---83683543640.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/e7a152119fe17ce431243ba3026b6c61/35241510823.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF894 5364 bytes
SHA-256: 189b45aef04bf9be9acf90f01a0903ea1ed819bbe33fe2ec0c90df3d7d2898ee
font_01_sfnt_off00010ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE9 11076 bytes
SHA-256: 5afc5a4e219ec7517ee9ce4f44b9a74c12ec35d8ef7ca4f3c82537b2751490c9