Malicious PDF — malware analysis report

Static analysis result for SHA-256 195cb1a80211127c…

MALICIOUS

PDF

86.0 KB Created: 2021-09-16 11:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 40328ac33d73c6fc2f9d03f40f5e5709 SHA-1: 3ce55590fe8cf87f5ccef152b68da013dd9e4361 SHA-256: 195cb1a80211127c5fda6ea82b9470f91a56c7389cf7d0b1fdb923cf95c6d2eb
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites 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, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://c-six.it/userfiles/files/20599525536.pdf In PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f67f75f1f661b630eda8de64e80469a/zivozomuwir.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/dovelazowugobelinexibu.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/jikopevexuvisaj.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/vodefavape.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/bulixod.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/11704998263.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bc51903af---nufisig.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139aedeb1cc7---zovef.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/53686866052.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f7b93fe93---lutiwokavotoz.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/36504013223.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210912203304.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/42101489619.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb60227c4c---letugokugi.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/dopov.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/bimulefifukexokonetizib.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/33621353189.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/74303830908.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b6e06f079ffc66db9ca663fb91df30c6/75826308383.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/8050756436.pdfIn PDF document text
    • https://moolans.com/uploads/files/3173891515.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/30450426656.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/32873995546.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/luwaxidubepafurizuxivipo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e80473df943f535f6b6a084fa24a400a/gafujakitifetedogokosen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=led+70+inch+price+in+pakistanPDF 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_off0000eac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC4 10664 bytes
SHA-256: cfe128c23cf475113f0004eb7f0810e44f7da820b2b1f0ad989802a7be723468
font_01_sfnt_off0001032f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B41 18196 bytes
SHA-256: 40d97237682d0d9f585c082bc98d225f8c937d54596453eea8a0c6f5245eb9cf

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