Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bdae131e024125f…

MALICIOUS

PDF

81.5 KB Created: 2021-06-26 01:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4aef679838c8e59606eae87b3f70d061 SHA-1: fbb486c5b058037abb8ce5c5b143c6246278a3c5 SHA-256: 9bdae131e024125f42e6fd03783dec0513d739722f721872c4abcde2d763acbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It functions as a link farm, directing users to various compromised websites and disposable hosting domains, likely to facilitate the download of further malicious payloads. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://mimpisiluman.com/contents//files/jitadefamedufinisowu.pdf
    • http://hy-concrete.ru/d/files/70183126743.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc1eb570e6---nubozobiputazeworik.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d5431fc02---4515185747.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842ee226caa---wazomeval.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bab4c77fd---60295911081.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/61167ccdb52c94ac5dffdaf43d6deb0a/samuluwufaxesadefov.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/88ffb2f9b0ac43d0c95c5bd9aedfe00a/33089900311.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160923f7d3c628---22313268238.pdf
    • https://bobecoingatlan.com/uploads/editor/file/38451958017.pdf
    • http://centrons.com/uploaded/file/139078989460c5de5c184e9.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/826575ebbfb70eef123d68a201947826/71571547422.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/1deaf238dec4bce66276a5e5963172ec/wuxivibevazowabiru.pdf
    • http://nuestratierrapremios.com/campannas/file/2813932700.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/35afa7c96f5853a6006b0e263c6b250b/latanujejin.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c69ace369---61984643011.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160984295518d9---dapivusowejiweviremofano.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16082b73d4c330---vigurezigoje.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/fabexasirono.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608317b9eeeea---sekupusilaxekosugote.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/8jaqbgeck7j7ck1djrrhib3gg3/werufufoxov.pdf
    • http://ridendo.cz/files/file/43318453047.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=adobe+pdf+reader+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de4e.bin
77abb7f5bec19b4e35e9fc65502689807c22ba9012b6404874285b265bdaac70
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4E 10300 bytes
font_01_sfnt_off0000f557.bin
579ab15a71e5eab003bd89ba10eb4de57475c6214f5627b0d54916f879cee7bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 16764 bytes
font_02_sfnt_off000120d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120D1 16792 bytes