Malicious PDF — malware analysis report

Static analysis result for SHA-256 12826cd67f3251f8…

MALICIOUS

PDF

70.2 KB Created: 2021-09-11 08:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6fd6b5dc3dc997984adf67306bbecf2 SHA-1: 0961090ba875a8bb2d0a839f7419de33cdac6042 SHA-256: 12826cd67f3251f80479f32005f7aca6cf49b8d66ad958fb66685603ff62251d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://alvitraders.com/files/93274164027.pdf In PDF document text
    • http://modulobase.com/userfiles/file/49245947600.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/tinetanagiravaxexa.pdfIn PDF document text
    • https://kuepancong.com/contents/files/gidoxatovofozunadeb.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161369bd82210c---wukugunogo.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/21248009702.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/zujajog.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/mivezodetelusule.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/24218221625.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/15589173850.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/6fb2s66ht5bh46rq1nvebpfuu0/kawufoxijivupufos.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/vumom.pdfIn PDF document text
    • https://costarica4d.com/contents/files/furupemedis.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/koruwi.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/60243970751.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/52853478380.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613401933e6e9---88989673767.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/zufabav.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/7880350186.pdfIn PDF document text
    • http://intertravel.hu/_user/file/46096481938.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/xolozize.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/4035282363.pdfIn PDF document text
    • http://attlas.center/userfiles/file/sisuromotuwan.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/sibiwo.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/bedomumijukujufisif.pdfIn PDF document text
    • http://salt17.com/userfiles/files/mosurosudibalojurime.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/15951165276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+download+apk+and+installPDF 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_off0000b6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DB 14396 bytes
SHA-256: 1def3e750d27ab0d7612b88e93f4039488d10b8ee0b6166f695bec69464c5aa2
font_01_sfnt_off0000dafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 10412 bytes
SHA-256: 22af393bf7c068f6763fe5f92b4aefc90a92ac31ce7ababe34856afd0c527f71

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