Malicious PDF — malware analysis report

Static analysis result for SHA-256 72defe425b15f259…

MALICIOUS

PDF

110.6 KB Created: 2021-06-29 07:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 61417728a2d8b06ff152262be32ba5b8 SHA-1: 0c4d74ae4dc12b1292c15eed948522cbb499dd82 SHA-256: 72defe425b15f25998eb4992ed41bb5d205faa5d5fe3d3e1f3094464724b24d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of an embedded JavaScript stream and a large number of external links, many hosted on compromised CMS upload directories, strongly indicates a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support this assessment. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://angelcabrera.com/FCKfiles/file/kilivozujosupikeketoji.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8ruadfmkr6mh51id008d2vkrvs/8651984460.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ea0a0da00---44341526722.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v254hnbs4uo2964pniqgaai3p0/32616357211.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608797609bd6a---77674828789.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609832e21e850---70435390432.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/4777a01c01c6f5b73fe310d1916db440/22158265004.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/86848410981.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d46d9cb71e1---54148252456.pdfIn PDF document text
    • https://memoservicesrl.it/file/nerijotapizezugesenol.pdfIn PDF document text
    • https://digireg.ru/upload/medok.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/08883ce810cfe6cc047b6c2ad0601d1c/xidet.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/42236607322.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/dobelukiga.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/27515578777.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/gemekulufalovevati.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/3dffdcd3f4afff3bdb65b16d7e59d439/jowujegasagizu.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/42021611898.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5a32372b4---sanajuni.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/n0goa6tk8l34u3ehpfa3iatuma/bejemogamujub.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2ff5ec7d26f71fcc08b3682c12827c0c/bopituvafanedotewuwidaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=words+that+rhyme+with+beginnerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12838 10984 bytes
SHA-256: 4a01d08bbe7985f11f97190fa8889d941e1cd385bc435ad6c49048acd46b0e6a
font_01_sfnt_off00014167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14167 17552 bytes
SHA-256: ab7ac26c03bcfd6d7b5993e9b0a3479bab91e4101fbfa8b2031ceddf95ad9fa6
font_02_sfnt_off00015c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C10 24476 bytes
SHA-256: 1bb451ffb0b5a96c32ed25e93dcb40b9ba31bf4859af3102a8d92b34ccc61ee5
font_03_sfnt_off00019619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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