Malicious PDF — malware analysis report

Static analysis result for SHA-256 76edfc37c5e918c5…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 15:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fc577403b58d81d3c46b32760d53da2 SHA-1: 61169dd69fb21a1f86e12baf444da60191feb889 SHA-256: 76edfc37c5e918c5d6bd59a0f269dbd442c3789da860f568d52e25a27fc204f6
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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 http://kawoka.com/userfiles/file/wovifajexakozikonalepidi.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/xasaxefagafisokazowof.pdf
    • http://learnersdigest.org/userfiles/file/69812881968.pdf
    • https://citytrafik.nu/images/file/kusewalabikop.pdf
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/razuralexeniwagugolar.pdf
    • https://defi128.phpascal.com/userfiles/files/vumulagibi.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/aea39de9384a4df1a6622521bf9eb7fe/gopopepew.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/97ea8eae87fb232ae109e7ee9fac1fbe/74128041186.pdf
    • https://onlinendttraining.com/files/36579900497.pdf
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/35864911867.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d526d765f1---21535452442.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c2b65f167---54190153464.pdf
    • https://readandenjoy.ae/userfiles/files/nuvibibonugokizovovamidek.pdf
    • https://doluhosting.com/calisma2/files/uploads/ziner.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/8jj9kfefikm0c4inli9vo22dsh/getuvaf.pdf
    • http://energy-labels.com/userfiles/file/miperugudarozesivusukape.pdf
    • http://qca.ch/userfiles/file/60011621535.pdf
    • http://vigen12.com/userfiles/file/31451153847.pdf
    • http://kronikarp.pl/ckfinder/userfiles/files/70205928391.pdf
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/28097991357.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611678ba6a57c---lobekuwobujez.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/db90d17bb369088866be02c21f8855ef/87537137508.pdf
    • https://pgp-puh.hr/fck_media/file/20878392240.pdf
    • https://hotel-la-licorne.fr/userfiles/file/mafuwufar.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609404911a0db---kunasavefuzuxapes.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=hs+code+list+pdf+sri+lanka
    • 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_off0000de27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 16792 bytes
font_01_sfnt_off0000f63e.bin
ce6b6a73402c589226fbd210fa9ed7115b0181f6901db5a298552d5eb634bdb0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 10696 bytes
font_02_sfnt_off00010ed1.bin
7162a27a207645ca217660a3b4a9bec158c460dd370e32be2e2d350fbbaf2550
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED1 17660 bytes