Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe08eff392a39050…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 01:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f37cdcc4edc5e26a51020c203921b088 SHA-1: 89a49f5fb0c3076378d74c7db306c8c4fc995a46 SHA-256: fe08eff392a390502c0db6b1a0478618f7ec36dace31ef8915ca0327047a23b4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://iamsong.vn/uploads/files/68108012618.pdf In PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/65794985669.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///xexorivupukanen.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/fubafegijox.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/gopizasuvojugajajiser.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/27205665032.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/9e47reioc9ilk8evp9k2dirnd1/51526075107.pdfIn PDF document text
    • https://aaaxxion.info/images/file/58506172483.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/fdd59295e41f41d525c1c437bd2c8d02/12423477281.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/donulo.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///66239431657.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/31211241622.pdfIn PDF document text
    • https://kiptep.ru/file/zexagenatijofegejaf.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/mamiwugetofedobilijokupip.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb639a1ae4---71600170587.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/xawaniguxedijinezawad.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/pikixalikaluzosikes.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/gevawirofiluduvalaxaxe.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/77976132620.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/4711851744.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/78025464714.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/telatukokewalaxapimas.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb0c388576---disatudalu.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/43488599447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=arijit+singh+indian+idol+contestantPDF 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_off0000df2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 10760 bytes
SHA-256: 2d501e547fdf37661711a2b96ddcfc62a2cb5924a9c7dd968f84bcd604bbf5aa
font_02_sfnt_off00010fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA9 17624 bytes
SHA-256: d7d120d878a6c2e3b8ac770c72bb18a9527ba1446ae6f05b686df20e3a623b67

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