Malicious PDF — malware analysis report

Static analysis result for SHA-256 23625f91226be84c…

MALICIOUS

PDF

95.3 KB Created: 2021-07-22 18:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b01725240e5a637a3537bd774375881 SHA-1: bcf20412c0cae34cfc72a6e8868a2a25b16a0734 SHA-256: 23625f91226be84c9be738f77e57a64d664889b29b744f47dfed9bf15279a8c2
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating it's designed to redirect users to malicious content. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests a business email compromise (BEC) or financial scam, aiming to trick users into believing payment instructions have changed. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://gangwonbnb.com/FileData/ckfinder/files/20210703_D6DA5927FE9CEAA7.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bec9651ab7e---pebufituz.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/3853fe0bdb107065a1004cf9bd3a058d/97898594549.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160742a9beca21---99182034862.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/9d33ad85a20c0fcd2150dfed8c6be341/ravexegebinelo.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3abd4d1e42---tipuwejogoferurexuxadew.pdf
    • http://shiinamotors.com/js/upload/files/7503469688.pdf
    • http://uppercanadatwocylinderclub.com/clients/877835/File/kufasezafonelibowusa.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3csg4daf09pjjn0b2uj8u05i3f/30846913875.pdf
    • http://szzxwx.com/Upload/Upload/file/20217211036581552.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b920e4f2dbf---jaxemujadapabogoga.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/1vis9q06dqoh6iqhnac3hmfmq5/gurolazogiwepivit.pdf
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/71717078346.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a4431d8508f---vebagaxudalun.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3s7i5ivm26991q8n6fp9919do6/bowunonedosexure.pdf
    • https://lexcyberia.com/userfiles/files/73437671712.pdf
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/cd89f36b27419110cdf79bfe6cf5b958/78408707641.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c0670a79fe2---8780084680.pdf
    • https://kingcarmotorista.net/uploads/files/pepitodafazuzokawovox.pdf
    • http://mobydick-band.de/fckdata/file/poruzo.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3646fbfd62---82337535793.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16096d04e9ca6c---lafereditipefusufuba.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba72c90f952---27790706610.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=apps+that+help+you+answer+questions
    • 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_off00010fc9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC9 16792 bytes
font_01_sfnt_off000127e0.bin
d1846c2dbf23c78a3579ffda7c773b454b55f209c527a924f646374dc90b886a
pdf-font-stream PDF embedded font (sfnt) at offset 0x127E0 10776 bytes
font_02_sfnt_off000140c4.bin
9c0f7f9b2144862b3035d4f374cdd773cdcbe75d505d1c4083d1dff61852ea43
pdf-font-stream PDF embedded font (sfnt) at offset 0x140C4 17264 bytes