Malicious PDF — malware analysis report

Static analysis result for SHA-256 129649dd17c40733…

MALICIOUS

PDF

76.1 KB Created: 2021-07-07 00:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01639897050eacaa1d7f9c33df9dcd7d SHA-1: ba896169a15788a5cae9b9aa0be1cab41549f8cd SHA-256: 129649dd17c40733e5a729839e7158a515a607009b3ad0cb48196d737e7961a7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

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 https://allytemp.ru/uplcv?utm_term=ecology+concepts+and+applications+5th+edition+pdf PDF link annotation
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a5ab1adff---vasamobikedibuf.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160db8cc5775d2---36096877135.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5874ce1f3c---42182922909.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/fanokidazikive.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d3495ovn1e1qcc8qsho0p213f7/porojusaduz.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd601e5747---2112448175.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/q1k6bb4gl9tr4usfm8knav1fjr/noxivirexupogoz.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/kudesewanesivav.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cc3a55ed3---93041096642.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/bamufawugogakexe.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa391e1d0---79935825230.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/65215209831.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ccd29aaa5f2f82f570d8d8269e333322/xevirijasisedu.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/vexuxaperekomefeje.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5afd22c47---wiravusosozifimufo.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/596e474ef1a2b461338c9d318dbdbca3/mafupaweki.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/59480929667.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/naperakirebizezowikofitex.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wizan.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/6397063fdbbca0153d43b2827beaef87/kopidari.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/16322305265.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/53479447280.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/mezezumo.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/ed13ae968e5f14b1114cfd546c144d9d/riguzagereposojik.pdfIn PDF document text
    • 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_off0000c128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC128 17456 bytes
SHA-256: d1922f22643f36c6f1fe4a266aed9ed2a302711ae1440278761310915f7bb753
font_01_sfnt_off0000eedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 11028 bytes
SHA-256: 441dd894b02e7b8a4d2ef60eaceae9b690bd1ebe5d062773fe3ccdd53305c2b7
font_02_sfnt_off00010854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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