Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5762fa45c8be82…

MALICIOUS

PDF

77.4 KB Created: 2021-06-27 10:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cebcccab9fac32a26edf35c4dd7b1b37 SHA-1: 30d483cded73f2fb8a9f88a56e52173df2f79c98 SHA-256: cc5762fa45c8be82c51c7d3471d2d091cba2e1e55cfed6101c25fd86e6c1f339
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple distinct hosts, many of which are associated with compromised CMS upload storage or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://a-kamen.com/userfiles/file/4809849942.pdf In PDF document text
    • http://royalproductsonline.com/userfiles/file/53514672627.pdfIn PDF document text
    • https://papiratisk.cz/soubory/84953093201.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4669ef2f8---89454401091.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ade6ccb3b4f---85755588058.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/lipalun.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160701916ae7a8---jifofa.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/kowowijiludomijifetawudo.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852b9fe78d1---jurezevufobol.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816ffd0150b---poroluwikop.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/temavaduxawumijoruji.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/menes.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1daab80ba---16148240817.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/f3fdfcbeb76b0cd3533f6b585cb75d6c/13329358349.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0607b1d5f7---36055412589.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/29430346825.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c95c0527a509d39a8e3b5131ece4fe87/85650944775.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5bfa6e7ea54a56922f33071bf98e0321/dukeda.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/95899760283.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ca5df233bb30423af812dc79b7f27955/wetupilamorusunepawor.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/kavegakisinetajijujolir.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/85c8b910854b3489097c46a2a671a7ca/jimeditiboketijegejoguweb.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b01b7a7af---xidatojonakubegekikidawes.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/56101757328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=was+a+long+time+agoPDF 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_off0000cdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC4 10344 bytes
SHA-256: 387ff5703108a37d8b9e4164a68653d3db88926aca2f8851b87a8e4cf568c42e
font_01_sfnt_off0000e524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD36 16388 bytes
SHA-256: c88ae3bb29738da2dcb8a44a5b8ff1dc2e7fb603fae10ff9a53c562677b301ef

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