Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f02b6b36ac7d47…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 00:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b25a8ee97413c2e5e4d3e4535f8dc6f SHA-1: 9fedf74050b2f473b22ebfd9543d868e3a00b897 SHA-256: d2f02b6b36ac7d473c2000ea701eca5b09b1426c03df60900c0d9e287ff3447d
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing further payloads or redirecting users to malicious sites.

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://coretry.ru/uplcv?utm_term=smm+proposal+pdf PDF link annotation
    • http://ahjygjg.com/upload_fck/file/2021-9-8/20210908064905950186.pdfIn PDF document text
    • http://drironcat.com/images/file/dakifaru.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140a3593e952---93365540059.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/fanudosibivometujipaxi.pdfIn PDF document text
    • http://veitali.com/upload/files/44216945371.pdfIn PDF document text
    • https://www.nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/98071344787.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/3414863451.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-21/20210921055910239808.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/fojabozififubudopasoxuner.pdfIn PDF document text
    • https://vzglavniki.net/data/file/bawirezu.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/79021081230.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/84337927963.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/54848403369.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/kibug.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/3607340731.pdfIn PDF document text
    • http://identik.hu/editor_up/mobebivatuf.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/1bf8e9d8cb6a996af79d5ab4959722ca/72602305613.pdfIn PDF document text
    • http://ge-mak.com/files/46142266299.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3b45fc37426d39d5cafc4ab46d5291a0/pisotizo.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/zebijitifuwato.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/regatepusal.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/wovexo.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eee4b04f93---goxetanefon.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78365229608.pdfIn PDF document text
    • http://tykhchem.com/upload/files/xokazatowuvukakobelo.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/bibunenikenob.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/89375711537.pdfIn PDF document text
    • http://www.siposferenc.hu/html/fajoxigalujugurabanaro.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_off0000b35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35D 10308 bytes
SHA-256: cfe7d5c339f850ed9097ac44d293c5d33c9ca81aa4b33dadec117cc75d20b5da
font_01_sfnt_off0000ca88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA88 14804 bytes
SHA-256: e64d76839917fd503b43b257fc642b3bf4fe07eb03321edac0146583157b1a7e
font_02_sfnt_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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