Malicious PDF — malware analysis report

Static analysis result for SHA-256 e524316ecc947364…

MALICIOUS

PDF

86.7 KB Created: 2021-09-09 19:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 42fada5ab9f21dc631711ece75ce5069 SHA-1: 2af9b13efb578023c860b3ba3a73bbaf6fcd6f2a SHA-256: e524316ecc94736488c25d64eed76ecd6009a8ebc2543de30d721637c7346511
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ritadas.in/userfiles/file/jekelopowu.pdf In PDF document text
    • http://robbes.nl/media/files/wupububugabekevenobapivu.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/96602533805.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/votudine.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/kivusanidipebixunoziluwul.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/67920771685.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/pevurenelunaf.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc704269964e734048ddaa83c21e437f/rakukeweromuwejasovuxezo.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109090826528765.pdfIn PDF document text
    • https://x-software.cz/data/file/jufeneximivodowe.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/48151114137.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613090b4d2ea0---zivutumor.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/48935875377.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/86978883005.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/daxatozirebup.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/nojebugovazu.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e4cdc91a1c781e41a153b2eb4efe7cf6/77835495472.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613668d9e0139---bepelubenuva.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/puridesuxelofedakud.pdfIn PDF document text
    • http://seamacros.com/upload/file/nilogufasake.pdfIn PDF document text
    • http://poorclarescork.ie/images/25328244838.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/6261517.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/sedetapagelivulani.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/14026757837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+sdk+sample+applicationsPDF 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_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 10748 bytes
SHA-256: 3bdb3bb80ab4bf48c5b5b3175d77b463c229bbab31563a2a49e7118d94e868c1
font_01_sfnt_off0001045a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045A 18756 bytes
SHA-256: 55e1efd87d07a244ca7739f2622a4997407a73adf44d23616da6a2807f12c3d8
font_02_sfnt_off0001353b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1