Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a306f80d4c1cf7d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 08:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 63bc698cf010ea40e78163bda1d80252 SHA-1: 6d35ea00219479a9d6de529d5b9ee348264c191a SHA-256: 7a306f80d4c1cf7d36a90bc94c366c5350ec22d2c1597c1cd89e5d998e13524a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and numerous external links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=tracing+the+letter+e+worksheets PDF link annotation
    • http://eurekaelearning.com/upload/news/file/42906748746.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/wuruwokonilukod.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d0ec0a5fb---daxepinafopovufesosane.pdfPDF link annotation
    • http://aven.su/userfiles/file/nadoxid.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/1ne5btd08tuj97rc429coa3g8l/31474910461.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/99286978032.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/rifafomag.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/banemapimadosunup.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/sivikir.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/74291735670.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/kesifaf.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e3336fad7---46492336963.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/senutumosetulu.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/dururasijosap.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/nuvogutabovefewiw.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/890d779183c5a9962a340aa406f99bca/ponurazadazodepale.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/gazujaj.pdfIn PDF document text
    • http://castel.lu/userfiles/files/28514199152.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/befenajifuzupilerin.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/58632971429.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/zawujijevuworisudogile.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/31356179258.pdfIn PDF document text
    • 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_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 10648 bytes
SHA-256: 87190100e91da9ee728187b04eb10ec340127ea37a8c9b48904c260cf87df6df
font_01_sfnt_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C88 18024 bytes
SHA-256: 11cd6ce7c6a6d1f0e301d396361c59fcb217c9d13e4e0aeb0ca533d2d02cebbd

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