Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96b4761bcbf8e61…

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 12:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 72d014b1516ccbda3fd2bce6ea98842b SHA-1: 9d9e83f3cb41be0df20b183567ded8378a58b147 SHA-256: b96b4761bcbf8e6196b34bda2bd76d4aedf6eaf01012319b28cb7a09556932a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the presence of links to external resources, some of which point to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://agrimal.pl/userfiles/file/botut.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614cba34e475b---62154482348.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/4803563410.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/19145006853.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/mizoxexukir.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/sozorod.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/56144127078.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210924_A4914EBF4326CBC2.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f570f3c268---wigelaxijubiviket.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/balokulezagigeg.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/31197770360.pdfIn PDF document text
    • https://kar360.com/resimler/files/misivilijarafe.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/befinubawugojawikeworujur.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161488639971b8---467788683.pdfIn PDF document text
    • http://wernitznigg.at/files/sarivivopubi.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/nozuvadatekawedebodu.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/92514645435.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/43026698470.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/neseburawobamedar.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/88928450059.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/57990547101.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/xajitolozimunasofidonokep.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/nusupexubizusawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=nds+emulator+appPDF 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_off0000b274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB274 17336 bytes
SHA-256: e642b9e7a19b669b340627d3ff9c6ccd076ef53176bb32f171e139a8aa7cfdb9
font_01_sfnt_off0000df4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 10436 bytes
SHA-256: 47f9ee637756b6387d4fd4f4bc2cfde3b08854c96169633d20af81673b37e494

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