Malicious PDF — malware analysis report

Static analysis result for SHA-256 160f9dee8b4f840f…

MALICIOUS

PDF

84.6 KB Created: 2021-09-04 22:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c414f8ff9c891f40582b041c0375cbb SHA-1: b193e10852f36584a9285b191b43887998f7bd36 SHA-256: 160f9dee8b4f840f6f28462d199640ed23a5dcbba952e3fee492b5e1a6b991ee
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 WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://rubyyadav.com/nbloom/fckuploads/file/20820235011.pdf In PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16110168d7c00c---84613853325.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8625f3e515---25530964522.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/9q64lagiu86lr6tq0336jdbgg9/viwolomaboleji.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16121d968239ce---69646370483.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/kesometavaw.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050115570869.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/92031644834.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/35957846646.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/zojegimufavuwe.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/lovomoxemapuwegojezal.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/71993219609.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/82822959342.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/me7e1hoief2b4gbs131rv3l97u/kitexazonuk.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/kazolite.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/46871381596.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c6d5fff535a291fdef0cb07915ca4dc/6540183842.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7166ec384---puniwoturumobifezegigever.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/16614881732.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/fowisinunule.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/69566751299.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/lafepotugezaf.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c21179c0724---13661061463.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/15263561368.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/1b971cfc79a976123d7dd7fcd1edd361/88208012174.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2ece755b19890f544c99ab76ae580653/jutenumejisakuzopevizumu.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e61f282b80c057f3a8c8522e19814f6f/61190733670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=control+system+engineering+nptel+pdfPDF link annotation
    • 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_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 10824 bytes
SHA-256: 277a648d05d4e14e72c963808707418e2c4b6b47458e3e7203db121c75433bdb
font_02_sfnt_off000113ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 18528 bytes
SHA-256: 2326f44c19311e79cd0532bb0402f4b8c42536f9d67ff523278ff221839f0f22

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