Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6bb6c42c46a245…

MALICIOUS

PDF

69.5 KB Created: 2021-09-19 18:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a6ffbcc311dd93edde6087ae2d9e9948 SHA-1: 23121c21dab76a24f887922b9e0fafe3d9c420ec SHA-256: 5b6bb6c42c46a24578dfd48ef98c4538622580b86c0d01c4261e72916444aa36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to potentially compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further payloads via the link farm. The presence of JavaScript suggests an attempt to execute code or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://negaratoto.com/contents/files/sibuzunibi.pdf In PDF document text
    • http://klaaswester.nl/img/file/37874499764.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/misimafumetusegude.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f26f710b89---ruwikenumaduwuzabikaf.pdfIn PDF document text
    • http://azizolace.cz/images/file/97781028943.pdfIn PDF document text
    • http://chengzechem.com/upload/files/zovabuzi.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/29417480660.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/fitiwixavaxukedijotamekov.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/sakuzupar.pdfIn PDF document text
    • http://atya.eu/files/file/pefowineja.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/84c65eb981f5e71beeafc00389522864/rugarofifedax.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/6515100042.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/tidegejunesipe.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/jumavuzubesurolaruza.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/64044138600.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/dagenigof.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/fexiw.pdfIn PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/texudigeledinegonagarokij.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/furinitotivud.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/dipuwajusofazasumak.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe7e523fdb---jozejinov.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/vakesudanedil.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/19275414608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=live+tv+thopPDF 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_off0000b5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A5 9792 bytes
SHA-256: e7b59b3aa1069b2b4a1a86d37f30295aeda16c186a0c278401659cdd493148b9
font_01_sfnt_off0000cb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3A 14928 bytes
SHA-256: dc3d5113de566523a2a1747dd72825f6e4807dc41130fc6d831e3e94f2282a2f
font_02_sfnt_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1