Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38778d369412d03…

MALICIOUS

PDF

94.2 KB Created: 2021-08-05 14:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 16031620ff07c9815bc42d6872f7d1df SHA-1: de8c9283fd29f2dac4c3594633b85ba5e8b5b247 SHA-256: e38778d369412d0305d9f70e6b43c9f827f1312171189a3c3a02fa65d96aa043
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing or distributing malware. Heuristics indicate these links point to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=scrapy+tutorial+ppt PDF link annotation
    • http://ndt-tl.ru/upload/file/jagizuziserilun.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/84420699086.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/37871134908.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/37298173659.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/40631766170.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/jibukuxadezosarepurobaxi.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/upvagj7qlq0t7jbuq4e3jh0iqf/sidutoxixerubipasupi.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abff34959cd---besexudefawo.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160806c8ee3091---kofukonasiro.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/vigujekufiposig.pdfIn PDF document text
    • https://kildevangen.dk/files/babosadidosetabudotigam.pdfIn PDF document text
    • http://berbun.com/user_img/file/37732672573.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/wemasakuzujatakefodixir.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/49563618553.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/wedurerurowafokod.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/57514967378.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/37458139047.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/17041646956.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/63636598286.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6259584fb3---rigufalobidiz.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/48420903059.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/mitaguwunupufaleve.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8b4ca6f8a---wokilabife.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/cd320da7d627322ded03a74cefd92171/satemexelidevedupar.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_off00010ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA4 17340 bytes
SHA-256: 51adb24d795321a5fc4c3de3bc32e79444f13d52644e00600b67f63b25fb35c3
font_01_sfnt_off00013c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C06 10252 bytes
SHA-256: 86cc12054efa11d7879ed1792b556d738e1c06e8d0b6d69aa280759aae199a30
font_02_sfnt_off00015339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15339 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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