Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbaa14e10f36b8f…

MALICIOUS

PDF

90.3 KB Created: 2021-07-19 08:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8505bea45d4ce3b84aea0f00100a5066 SHA-1: 19a8aa92bc888d0240a1d3988debe86efb16d811 SHA-256: 8cbaa14e10f36b8f002ecb8df696f74dbf829e1254271a34cf058a3e9d4d5d8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest potential for further malicious activity, possibly involving JavaScript execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://pelletier-tp.fr/ckfinder/userfiles/files/62741719538.pdf In PDF document text
    • https://akapacha.com/userfiles/file/mawurifiganes.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41a9270890---41876562380.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/wupemu.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/97807090383.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a929c00780b---pofumijepiluzog.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/sboglff62l8uv8v6tnk1q8m337/86792535958.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773138c0850---posusagepev.pdfIn PDF document text
    • http://www.hmcpacking.com/uploads/files/zuzuxel.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dec5a9cb0---88319058362.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/aca5d53aef00b4a19873e71e444228dd/31561833577.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/pixowolixuzemiguvezuxineb.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/epg36o0vuhum58ljb6j8vgo2n3/jofovifeligilir.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/bonoropudagipipepawa.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b5a488d6d8f70abb753a31b3bddb2e27/30534687362.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/rugiposuf.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/139a50fad226fb17e55be1a9d684b2bf/54714095810.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/69723083678.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f3b5a239e2a17f4c312fe2c035086d59/92450526334.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rdhilinte4o4e2q4kqa8vvjua5/62736073531.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/4ciomt52ndf66lm18c7fc1pqtd/81649095855.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/67839371331.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/kowetizebokezasase.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607395a1b9a2c---55337143146.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae11e276877---vufuzigutilimenaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=reported+speech+pdf+rulesPDF 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_off00010016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10016 16924 bytes
SHA-256: 34b4eb28e0848da762d04c444c83ea5d09ee030352af7c91652ba8e8914e3207
font_01_sfnt_off00012bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCC 10504 bytes
SHA-256: 8d9c759e88c3b465efd6c1d0e62a693164b4dd154ef35f34073be1c8472c3bc4
font_02_sfnt_off000143db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1