Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c66ea1d5a54ebb5…

MALICIOUS

PDF

86.5 KB Created: 2021-07-08 07:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 04395c654cfc1d1847b1316d44602f44 SHA-1: b3923301cbbf7c5bfd518210ba5b6ed4633a5eb6 SHA-256: 1c66ea1d5a54ebb52c5baf5173dabbdf143235f4dec8fd61cda1aabf0b833bf6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous URLs, many pointing to WordPress upload directories or other suspicious domains, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://studiotecnicoarduini.eu/userfiles/files/29071529004.pdf In PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/49706d74c3816be9c7a2533dc46c1413/radofupesaminunazud.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ae164544e4a051a1dec725216e610d9e/fekitadunipizu.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/jusujatuzuwoduwari.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/aa8ab50586245403280532aa2efe6022/lofibepileba.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/41345395231.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/lipedikijurefuvuguz.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/ragesadoburubiti.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef76c22244---sorawaxuzizolofelevose.pdfIn PDF document text
    • http://dogable.de/userfiles/file/52741043171.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/gulifej.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/tapilidujakusesir.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083f23c0c887---mekuwalekuzojaxunopezinid.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/50668074430.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/57d7069f1e16cc537b5faada60516ae3/26599056357.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dfed4d67b---45170094909.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/welesugaverujirazelizud.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f85f3693fc---16901904562.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ec108de29---61531286410.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/gagoxuvedav.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/fukulufewuli.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/0f8de5cc98b1803966bc92f1071d02ee/48143398177.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/58389975118.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45fa1c21fb---46738436961.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609637540163c---50193111731.pdfIn PDF document text
    • http://webursitet.org/Files/file/loduzoworazevar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+hold+a+bass+trombonePDF 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_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 10640 bytes
SHA-256: 0d7929718bc0cdd45165fc5ea43e06bc130917719fcbdcb498faedd6904be65d
font_01_sfnt_off0001077e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077E 17216 bytes
SHA-256: 8a77eff2a796061148ec5110635213d18399bfeef10feae7f5292c960c89e1c4
font_02_sfnt_off00013488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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