Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04a71f193fe34d6…

MALICIOUS

PDF

87.7 KB Created: 2021-07-07 05:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 05fdfd33a4ffb743530cd53b3f0b53ea SHA-1: 21904edfc5b5e383eae7be1cbe720e471604626f SHA-256: c04a71f193fe34d62467aacd503ae83c63afda8fc8cb506887d038a22ff30761
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of numerous unknown URLs hosted on potentially disposable domains reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a07aff77f8a---badeteguxakefujumasoko.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8cobfon73negirgnb2e65c3de0/1003944348.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/c8232804c28c5e10f6fb0a45375567f7/mefosetawinune.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/risoropiwip.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dd857523963bdedc6c418d861ef9895c/28043540258.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/da48d308f1c8b6deba9a88e62c1ac818/14464098793.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a253cbd53d---gijutepidikomasireg.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b058fc2aa87---moduj.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a57f08e0bd9d541bf386374cdae7c220/19182900205.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/54562640979.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f86e4eaf9---maxepumuwusu.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210610_F78593327D3A54FA.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/227d7b30c43e06fa9f9ca9408cd3441b/53994151469.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/tgp3fakfji2qe2laovs73qvni7/51835895597.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/sasodurifutizopelurez.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/17f048830da34ad551ee05a8a64f0dda/xozefejotesabemagexek.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/54611391949.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b64a619425---88864750420.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f7bbdf0c2---fukedewuvifiwatepif.pdfIn PDF document text
    • http://beta-rc.com/upload/files/tajoborixevigi.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/1854031163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=mutation+in+brca1+and+brca2+genesPDF link annotation
    • https://medlineplus.gov/genIn 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_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 17940 bytes
SHA-256: bcf679def33f56b1c55b9681038df4b4e55a67cd9d839161b5a1d0603d7f2c59
font_01_sfnt_off0001206e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13885 10904 bytes
SHA-256: ca7d4a84c012d76e75da9cdc728f346ac78eeb39134877294ec5e9657f632b10

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