Malicious PDF — malware analysis report

Static analysis result for SHA-256 337cc2b5bd94d0b3…

MALICIOUS

PDF

94.8 KB Created: 2021-09-02 22:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01361505b40e18020ff159a8f4abb423 SHA-1: bbcad785f6ef118547acdbceb67bdd5117f1be9a SHA-256: 337cc2b5bd94d0b3cf1dd26dcd6c415ee269a12f71fb409fecb78f4b2b0f3f7b
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various websites, some hosted on compromised WordPress installations and disposable domains. The embedded URLs suggest an attempt to lure users to external content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/cb74eef0953e8fb233ea3beca5ff3a5a/99261429697.pdf In PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/bojerrr62kflg4mr1s5gl3ri61/97079904111.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/67827177981.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5b10bbe8357a42f082ab0a755d7c38da/30699546228.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/66961904593.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/35f21f66606d07537ff2b92c758173f5/ditomuxuduzubojixolupagu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607467877a0f2---bexexaluzanotebuj.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/41412469424.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/41065000942.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/2835d1183a717ff5b41333a4149100f5/maxitaluwadux.pdfIn PDF document text
    • https://cape-electronics.com/media/file/roxewenevozofi.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/vebisiwigidesenixizidigix.pdfIn PDF document text
    • http://www.moyekolodin.com/files/34950960402.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/61a4a3a7d7019eb23a96df716b0d1615/wodomojidalexo.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/vc5jhe4feon489f98kf0s9vqi2/99829194761.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/45837357344.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/25528641633.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/83581859603.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/92219403742.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/44090377952.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fb807a684---82354889713.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160853f5f0ae64---55606923222.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/58351669970.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/3f0e3d98c74f9a4e07c3151226d3a4be/rodufiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=drayton+digistat+3rf+room+thermostat+manualPDF 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_off00010ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F5 11188 bytes
SHA-256: a4d9c5f809fc629e5b8d30bf31e1f28c90814b35551efeb1a47bf8c3da5c4016
font_02_sfnt_off00013ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCB 18236 bytes
SHA-256: c7d2b70b27ecd5f4820763181e05874b3b1828259f9adb4074dbf20feb8285d0

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