Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f10499310f3a602…

MALICIOUS

PDF

70.8 KB Created: 2021-09-28 04:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 873b15d98b063567c993ce2936b8c29c SHA-1: 7f8f8c40d7adbad338dd669f117eb42c733c73c8 SHA-256: 6f10499310f3a602774baaaf2d44f132d4bee12af81d65fe904393acfebd5c08
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using these links for malicious purposes, likely phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://www.champagne-auge-dascier.com/ckfinder/userfiles/files/dokaferixilofiponigurapug.pdf In PDF document text
    • https://bhsbeacon.com/FCKeditor/file/83988995350.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/99684958300.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/gokevub.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210914_5FB0FF2F3797BAFE.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/padusisupipebijemenozivi.pdfIn PDF document text
    • http://germainelecocq.it/userfiles/files/62804725794.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/liwapitanumejixavaxali.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/53584689489.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/20879213178.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/kasabixegagiwosokujo.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/repedam.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/sanuxawagizebu.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614c94e73b228---gagirironuludes.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/859225b1a084794c02174efb88fd9d67/5189115635.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109181710462611.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/natoze.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/871130e1cd4c1b2fd5a6cd96c6ec9dac/piwememebuwixijogo.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/6m8ajp0tubauvvjol0vdr5qooh/26841165961.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/24767665326.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/fepijupagosawuxudi.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/5222594293.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/4ffddbe4bf442990a2a88dacafd60fd0/28030345151.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/nokogupinidi.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/1918e1602f454203fcf58ccf7c896ca0/muwisejurig.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/5784548484.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140e43739fef---tuzumutusoroxegumijix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=monopoly+here+and+now+apk+downloadPDF 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_off0000b47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC95 10416 bytes
SHA-256: e85953f422ace09fbf0cd9faa389734840003dd12113c3c85d8072fc270e92d2
font_02_sfnt_off0000e425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE425 16348 bytes
SHA-256: cee4aaa9f36808328c1d2bf28bc7288ab19925fee9795fca4e393ed11f36956c