Malicious PDF — malware analysis report

Static analysis result for SHA-256 89bcd2adb3a7e5e4…

MALICIOUS

PDF

70.1 KB Created: 2021-10-03 00:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ae0c25de6aa6a7c708302218fe5e1ac9 SHA-1: 867a3de5ea5662af722a4b65da687780522556c5 SHA-256: 89bcd2adb3a7e5e460a2c87f861a9f81551a000a4019694349d63414ff110409
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://hanomanberjaya.com/contents/files/28501921126.pdf In PDF document text
    • http://starfishdowney.com/uploads/files/takegawowikujonijunewusaz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141afd186e81---88921914460.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/39647137483.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158ace4584f0---3111124658.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/seker.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e39223b54---23821235582.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/68642386814.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/47733466941.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/kadizubulukulaloped.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/sobojam.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/71627779797.pdfIn PDF document text
    • https://verner.lt/images/files/wesuguraruxesezelofuzuw.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/56946245945.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/mujimebunetapole.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/vuzapejevonapuzaxojasusur.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b722d049fe---ruwefaputotol.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/nupinu.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/luvujagevuwitof.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/sozunula.pdfIn PDF document text
    • https://asp2.aiwangyun.com/ckfinder/userfiles/files/worituz.pdfIn PDF document text
    • http://annuaire-regional.com/ckfinder/userfiles/files/14770621588.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd3aba18d1---vidabukilotokiziwijuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=expressed+powers+definitionPDF 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_off0000b369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB369 10452 bytes
SHA-256: c8c7588d4e768141055680c32c725039f4226cf6e5ddb0d8ff1c05d2ab39a443
font_01_sfnt_off0000cb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4F 15740 bytes
SHA-256: 170ab0a7e6d63b6a9ebf890cf63eebe858bbd396b868f8e123f8d0a57d462b25
font_02_sfnt_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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