Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d13c03c511144b…

MALICIOUS

PDF

79.6 KB Created: 2021-10-05 08:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cb8097e20f6758c24454ec5ddc5bcf43 SHA-1: 71dd1f7dd4d82b0939368e9e99474875bb50ab4a SHA-256: a9d13c03c511144b00b7e0d6a1f0e1157b627dbc8335c7b3caac1b49a359a4ce
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://queure.ru/uplcv?utm_term=cares+act+deferred+comp PDF link annotation
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7b9f22ea66bfcf6dbebfddca61c617e7/bosumodojedejazuwo.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/87159299086.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c8723db5dd2f290e9b90dd4291fa8f76/59504480725.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/pideg.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/zimomaletikirewes.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/25666872489.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/68147383474.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/38091943119.pdfIn PDF document text
    • https://dentrangtrisaigon.net/images/uploads/files/76919448168.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/gakarobige.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/13071774122.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/doxisazelefozapesi.pdfIn PDF document text
    • https://onecre.com/images/content/files/gelidofesajorozerajigif.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/nibimiked.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/banamubovibi.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145fbc04cb3f---tunapunenixigugosovotoda.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/16852017387.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161538688bbae4---kikanitalewulu.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/vulofarukuxuwisufibazukob.pdfIn PDF document text
    • http://drdj.friend-match.com/upload/files/84462052394.pdfIn PDF document text
    • http://sadrokartonyhk.cz/images/fckfiles/file/60308106533.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/di0sq2pqn0v7ik2sem9g1okcah/78080819434.pdfIn PDF document text
    • https://bukkosdiskola.hu/files/file/lopepizuke.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_off0000d050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 10572 bytes
SHA-256: b504d97e5269f7df19c83aa26224a3e4ae53a7e50645d581bad84ef4c51988ad
font_02_sfnt_off00010096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10096 18672 bytes
SHA-256: ecd334e90356f69107a0fee2cdaa3aa3ed370fcce2943760587fb6d4c6ae605a

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