Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8f94827aae5ae8…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 20:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d8fac71fd68174e8a2af5e8470f54f69 SHA-1: 2dd665eed247ac1e1517c66cf847f5ee6899d235 SHA-256: ad8f94827aae5ae81aaad8b28d9269b2a21df01440d961ca36c3c2fc8af7958a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=periodic+table+trends+worksheet+answers PDF link annotation
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/bb1707837461be95fe9cb367da046f1a/61629489580.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/3803421176.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/ralexerifed.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/ruxapimijabazufexiru.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/92669940705.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df6bcdf36f---suzumox.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/9885735321.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ab743a93c---80579290928.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/89408354251.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/kgq0ekalas24365h30b0k58ac0/tazituba.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ef8224a8d---wusumogizesolufixajid.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/ginisepovajebabiv.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/wawanuzikolug.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/b0a189f55fa9ff24afb66a5df61c3636/dizubowumegixetadazu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a71b6a3fb6c---49700288685.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089e735144e5---78971759781.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/tilibojisasedefagerita.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/zarutalirexuwu.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/nexumiki.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/81404175486.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/19c70e8245326b7e75a2fe10692d62f1/18256064165.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/vatenidatizexevojusi.pdfIn PDF document text
    • http://wajl.net/img/file/2021617131454.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/1a94c9ced6829622d41c895285276442/68252126309.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_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 17504 bytes
SHA-256: d0bda50130b21d40dff7158dca34deea7efc9d26cdf5b77c921f712f0112fc26
font_01_sfnt_off0001117c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117C 10788 bytes
SHA-256: 2a5f4e2d28c504dff923e7e928d21451679273749d9635e01ed3d22fd559ebe4
font_02_sfnt_off00012a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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