Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ab59cd69b38d08…

MALICIOUS

PDF

84.7 KB Created: 2021-09-03 13:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 901b19d56ea78887c71b8ab4bdfc3c66 SHA-1: 6c6b7c4a1346a0fd57d187934afb3470b36c99ff SHA-256: 28ab59cd69b38d082aca7fdef70a290a86e52c87ca0292d0ae41b57342f6ba04
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, some of which appear to be compromised. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://hennel.hu/sources/elemek/file/polirazorufinapat.pdf In PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/85549553952.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/saxazogakoparejuvakifidep.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f83a0446458---61162852769.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160856f409eaa5---diwojenabijesatavowudul.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/sujofowo.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160702c9bba106---jugefi.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/85895208164.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/riwatizafeg.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/beremuj.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/96122848021.pdfIn PDF document text
    • http://farashimirooz.com/files/deduveruwetomuxikabu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ef0d4bb97b9516a6ebe582254793b73e/xakibamumolun.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/aa2c7b642ea01b16a8143e315e903ccb/joxatobojusupowinijapupu.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae10d8700f7---36588868211.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210821_112204.pdfIn PDF document text
    • https://tckontrola.hr/files/49277181159.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c052849343b---fopatiliti.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/mizef.pdfIn PDF document text
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/61959430699.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/74762943885.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/xezovelemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=saxophone+scales+finger+chart+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_off0000e48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA3 11076 bytes
SHA-256: 74ece112501ca4d8c00aef8b1585231ef68437d206b5be5c2419fda1683e8a25
font_02_sfnt_off0001162f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162F 18044 bytes
SHA-256: cb55cab4d7dc179bec98e728a850be06a1ef274d5a8d709d39d602a94f8fb0b2

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