Malicious PDF — malware analysis report

Static analysis result for SHA-256 c405ad48cc24e364…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 13:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bd0d2842b840f08fc21e61a8bc7d202a SHA-1: d0e87517c6851ba1d6be074fa0356afe1c499972 SHA-256: c405ad48cc24e36460e1bd426a604e953ae87df27f95e386bc5acc6ea19ad2ba
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The PDF structure and the nature of the URLs indicate a tactic to obscure the true destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://idd.no/ckfinder/userfiles/files/15991713932.pdf In PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/9503212138.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/kunetixozem.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/jgmujaloavgbgeenvoteigbkt4/kogekibenusamomipax.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210531181934.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/58060652437.pdfIn PDF document text
    • http://yanartextil.com/firma/files/domulafevupuguzeri.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/9094788374.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ab2303e4b---rofukawopozuluguso.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/53212770545.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/lusuxiga.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9afb2cacb3bead13b0ae98544712efd6/lojobema.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/34895350797.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612b4a0f404be---33430922002.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/cad2c33a2b017b707b195a4bf6e917ba/40752099855.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be89224429c---wozojeraji.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/07d6853a8d8eb124d3577436e25a726d/48434143611.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc957a1dc---pimemut.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/43547493287.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f995644a4e09498920ef44a64ebf7ebd/vesemutevopotosebunorit.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/siwemoxafokalerivemajapi.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/tusij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=are+all+potatoes+nightshadesPDF 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_off0000e06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 17604 bytes
SHA-256: f56c9837f203e99a556c3f3b9d2a7343dfb7129faa1dc08e8bd4d82113fc8e49
font_02_sfnt_off000125c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C0 10652 bytes
SHA-256: 86428860e7e79e9d787e8cb9d5cc0ee2a20faa988f16ba9daf5bf1cf33f01d7a

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