Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c829dea31ea6da…

MALICIOUS

PDF

86.5 KB Created: 2021-09-23 07:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f6ca67037be0f944c50c35871cfd4f5 SHA-1: 2c1a2512845c111b39a7b0ef545cfffcc7cff3b6 SHA-256: f0c829dea31ea6da5bfb8de58832128292041954af5d83d73e555d232eac7155
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm or redirection strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=selenium+for+ios PDF link annotation
    • http://www.jindatunnel.com/up_files/file/20027354585.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/28924392256.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/kirifa.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/43627206266.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613499681ea80---53065811620.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/44303771605.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/95179089619.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109080436554975.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/felazu.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912cbc6619---83856144212.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/66198795917.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1723130069e799d04e7186ad95f792c1/lelobizum.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/5426803811.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/pijejasaviz.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/vijako.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090513195473499.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/44021054713.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/29444436936.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/42073729063.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/mejitakomasijogobobexige.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/vedolelukalazepegegewabim.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/vivekisaji.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/66001344872.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/megulaguwexikusijiwopowik.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/a800d51452fe3549cf99384cbac1e1ea/21013785099.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_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 18772 bytes
SHA-256: 14618371fa70bf515553bd98d75d3fea5e00bb61ccc91da5d771921d6bdd6010
font_01_sfnt_off00011d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D21 10288 bytes
SHA-256: 7d17cbd92c419051609beb32788d3fdf6f4eb8e764bb7c1839f2e76850a2fb76
font_02_sfnt_off00013431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1