Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29f240f8d30b725…

MALICIOUS

PDF

72.7 KB Created: 2021-09-11 09:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f677abd84969c6b237f69392d72a35ab SHA-1: ae6eeba0cd2f9157a60e34cd3211a0d5c698f168 SHA-256: a29f240f8d30b7256a53832427461a283f2d0db0ffe0634ec8b3e8cfbe660ec8
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially compromised sites suggests an attempt to leverage existing vulnerabilities or trust in those sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://ekorepetycje.eu/Upload/file/91389998764.pdf In PDF document text
    • https://dbmotorbrokers.com/userfiles/file/ninexonotulatuvigiruriwuw.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/81575360431.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/d4b4b464c275fc4674db66a6a72468ed/givimapitalowuluzejoselaj.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/44981224541.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/fc6e4546c91424b1d764741cfcb4e019/87173355461.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/21156064558.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/tewuvubonose.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/74087398624.pdfIn PDF document text
    • http://pnalog.ru/images/file/fexipezeroliwezusasigilaf.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109022027454134.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/tajebexekaxakogufatudux.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/82351894754.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/jomegawutukipa.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/8658732749.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/56073056492.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/4333935686.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/50672291580.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4dbdab3ec---bazigefunotuloxexeded.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/godepepakurided.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=super+security+app+downloadPDF link annotation
    • http://irodori.kir.jp/files/file/suzojosegalapalu.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_off0000b9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BD 10884 bytes
SHA-256: 5cd9fa95ec6456de61470f36eca57547947eef13b5d7960e951978a6a7534856
font_02_sfnt_off0000eb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 16824 bytes
SHA-256: 59e18efa82c2e869f30b0d9bbb98b167ac1621c5682213b03a4d287807dc7b19