Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50383d9c7c4c128…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 20:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f35c37a80176648278f08a161514be0e SHA-1: 4639bdeed076df4cc89e9f21d50b6047f6fec9dc SHA-256: f50383d9c7c4c128b42ff7fd7e8ec2a1063ea99385e229a4dd96cc059716ee10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://msiutilities.biz/documents/34377178774.pdf
    • https://truckforceone.com/upload/editor/file/wipijidetozora.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1614a44cf7c56b---84493051485.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161346d3f47c27---90867173501.pdf
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/folefomazomo.pdf
    • http://hbisan.com/userfiles/file/suxijomalizomuketos.pdf
    • https://eventaipei.com/upload/files/dunewibefab.pdf
    • https://b2b-intelligence.it/uploads/file/tuwomori.pdf
    • http://diadiemvui.com/upload/files/6437225516.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b54a28f43---34735346882.pdf
    • http://lesbambousbleus.fr/ckeditor/upload/files/gumisemiberupazozisizode.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613c90fd54334---82514249773.pdf
    • http://www.prieteniitehnicii.ro/documente/file/talejivurudobuxebax.pdf
    • http://itkaufmann.com/images/fckimages/file/tofifunibufugirop.pdf
    • https://datajournonepal.org/files/gekexowamupatumigisalow.pdf
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/mikidodasodubibipa.pdf
    • http://sanarina.de/ckfinder/userfiles/files/43249672335.pdf
    • http://alacarte-grafik.de/userfiles/file/wufiradevugikivipibakam.pdf
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/42910387295.pdf
    • https://www.eos.org.eg/ckfinder/userfiles/files/89941326650.pdf
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/64204893805.pdf
    • https://afritransport.com/app/webroot/files/file/fizobumiwijexobetawir.pdf
    • http://poliinc.com/upload/files/sofisudibomepemetolesixav.pdf
    • http://mopron.ru/upload/files/guposapobi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=psp+emulator+windows+7+32+bit
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b27e.bin
a74820e6afa8b2bbdf8d7f0b93dad5e5d2a6a6fb52a0e8cc5a3a91fca4684420
pdf-font-stream PDF embedded font (sfnt) at offset 0xB27E 14896 bytes
font_01_sfnt_off0000d821.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD821 16792 bytes
font_02_sfnt_off0000f038.bin
178a7a16dffa0da21023c9adabb12420c0765538a6e9ed3bff4da598a87f4b6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF038 11220 bytes