Malicious PDF — malware analysis report

Static analysis result for SHA-256 99996baf3516c745…

MALICIOUS

PDF

90.8 KB Created: 2021-09-12 18:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1abc6ab6dbc81146672c646bebe2a411 SHA-1: 6142e4fa2100bd3819ff8df52bfc3ae5aa96d2b1 SHA-256: 99996baf3516c7451172d6ebecff5db5473f209800818b805f457b77ff573766
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, some of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://genarchi.com/data/temp/file/vabijibegejadu.pdf In PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/fevef.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/vepilofosif.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/55476884241.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/jesopokisuvixudarubaj.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/46643773015.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/9474349959.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/55518548801.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/32438369851.pdfIn PDF document text
    • https://istanajp2.com/contents/files/35632999205.pdfIn PDF document text
    • http://spakimthi.com/upload/files/45380958419.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ef0fc47fe---96691011150.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/julepakogalunexasoxiko.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lieh6k5glo3bmpni62oc4rtst3/bugakudoniz.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/tajedafiret.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210909064515.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/buwunikoninujotagonesoxi.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/roruvujilojaluvuli.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/zedut.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/pnk7br5sjgogh5nh889bcsfia5/mavimo.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210909_6B73D47291347879.pdfIn PDF document text
    • https://12shio4.com/contents/files/rajababe.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/kubotomilegow.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/viruwetib.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/vobutuzaxufefimene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=weezer+kurt+cobainPDF 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_off0000fcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDA 10392 bytes
SHA-256: 7201b075afc4dcc71b137bf6b7b26948b5a4fdd9411cdf09ab284a7e3e7fd964
font_01_sfnt_off00011490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11490 18220 bytes
SHA-256: 720f466cb21805044013ab9a2ae8d9c2f1c18f12f7373c7d0f0365f5f8714ad9
font_02_sfnt_off00014446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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