Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ca3567e67ecec6…

MALICIOUS

PDF

116.0 KB Created: 2021-09-22 22:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 81e650fc1973d054ccb9f9a858213b26 SHA-1: 57039a38b1abda1c76eabb90518a07faa553fcb8 SHA-256: b8ca3567e67ecec65319d306ab61bac6aa0ffc02596e32577f14e6e0673352a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=schopenhauer+will+and+representation+pdf PDF link annotation
    • http://valdhans.cz/userfiles/file/sopimo.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/rananadeleliv.pdfIn PDF document text
    • http://lactopad.com/uploads/files/vetowopare.pdfIn PDF document text
    • http://www.77ice.com/upload/files/liluxomajirutasidugomaxoz.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/ba5f358dcdd5cde58de0bba9a0f20e95/74966722714.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/wivivakogaxura.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/98747191291.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/zidezufobo.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/fomokinokenezuxu.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/30673487248.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161416756ba752---12408847447.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/gumowatigitasi.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/12835112109.pdfIn PDF document text
    • http://strandedtattoo.net/file/kovivivunavamom.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/56480940961.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/rudaretagokozisiwatedikix.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/sazenufaxagadefopusep.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/xuxol.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210912101225_660048786.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/domifejasased.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/bapifesarelitiguwoju.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/59029604941.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8614cc97b---64635220235.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c849891646---60907811102.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/2331096084.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_off00015b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17327 10976 bytes
SHA-256: bf6049bf7eb071cdbea3c43cb8697833e13854d65ef281d54335ac7cce60f5a5
font_02_sfnt_off00018c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C99 20340 bytes
SHA-256: cd38fee36bb2715aca0ad0dceb9be80441032e16b4051ced4785fdcd60fe76e0

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