Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4eb22a7c53be3d…

MALICIOUS

PDF

86.6 KB Created: 2021-09-07 20:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 970e35cf7dec28f87f8efed2e24a176c SHA-1: 9a83d7ae1216b8a07683887b6e1a17c453034f4e SHA-256: cd4eb22a7c53be3d60e79668e943c5246c36bb840edbe8f61c64b478a83980ad
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous URLs suggest a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.passion-rnd.com/upfile/files/2021/07/23/fekigusokogagukuba.pdf In PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/55f619894e21db07f307818215813492/43337425787.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/86656709707.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/kt5qrcddvm9tu3fpgj11pmltej/nopelodexogadugipena.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/33143432861.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4831aa619---leduregikimefi.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/0653bf3c972ba2e63cc8e88e4f682c0c/zopus.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/gazitulisanar.pdfIn PDF document text
    • http://sakem.org/userfiles/files/73437833256.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/838720eb6b3dacf6da04c823b3a0da24/42995470443.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/xukuxizasusuvunomanekawo.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/bab1cd4ba69230dc04c0caf31a745300/54236996117.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/robosuwozi.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/xigaxadalikedojudekevu.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/0bf2efd0d1ed71cb6350fecbe37d0b04/82068493270.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/04be916698cb33f45735abf0bc9a6fb5/kubijekaxogovuguze.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/jazinafubimebuwizorakativ.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/d5kpu203cfs832efcr2lc5pns1/90443199417.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/nebabazu.pdfIn PDF document text
    • https://hoalavender.net/upload/files/5881363519.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e72471ac5---sifawebalitunatifibamek.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74e6d2c02f---murufe.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/mopadasulosanopufeba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=differentiation+of+self+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_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 10492 bytes
SHA-256: 125f5960647aa4d12b2b47843ab1ac0aa941ec3c18ca3a1d9550a993e54e281f
font_01_sfnt_off000106ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EE 18020 bytes
SHA-256: 5b6a9a6c186a74e52c33b9e36137afb8a5e63743792c6a688fba89ec153beed2
font_02_sfnt_off00013518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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