Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc984afe6599659b…

MALICIOUS

PDF

78.9 KB Created: 2021-09-12 04:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b4c03a18051b01f3b503e3ac5cda083 SHA-1: e65d17f0711ae7b9db8510dff36c72462092196c SHA-256: cc984afe6599659bb5ee78000fe928956e0fd69b9aa9a479e12234e8396bc0b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious by ML models and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, one of which is associated with a compromised WordPress upload. The presence of numerous URLs, many pointing to potentially compromised or disposable hosting, suggests an attempt to distribute malicious content or engage in phishing activities. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nomylo.ru/uplcv?utm_term=snapchat+apk+latest+version+2021+free+download PDF link annotation
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/73046249777.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4jbo05habuqnfmngt9acccef4d/jaboleguwodadedozen.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fffe701cb---77866761915.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/80773786727.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326730dc70b---38905603172.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/97695048899.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/37297627392.pdfIn PDF document text
    • http://rnralpha.cz/res/file/47758128368.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/qniqferpo7i53r803l0u75nefv/kumaber.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/tuxudolakavejumesakefe.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/suxapevafemafisabowale.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/mimipopajivitubapajisebus.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4a80d8682---voforuripevakozus.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3dede30dc---63979161182.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/puvinelufevilojekojoriga.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/82963678527.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/52128841759.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/jiwidaruserufunaniwode.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161391623c1d64---61658788279.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/bitodinomelomiganesotonu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161352d159bca1---49663898049.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/80372786615.pdfIn PDF document text
    • http://rilta.net/userfiles/files/sedudadibidasumeruwoz.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/84594273474.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/talebavir.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_off0000cc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 17892 bytes
SHA-256: aab498cc928f09fdde045b6547c6a2b176a1eff4e9c9c6caafa8746d983882a7
font_02_sfnt_off00011316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11316 11328 bytes
SHA-256: f8e8e4f3e903daf1226f540ebfd0ce463a5af5ddb8af450c725247a094cd3c8a

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