Malicious PDF — malware analysis report

Static analysis result for SHA-256 486439d8bb1546c5…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 02:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 37a34145b6ae45550841a71205f38094 SHA-1: eef6ccef3fb75fc32ae81328274a12a630c0bc25 SHA-256: 486439d8bb1546c5712cbdf7c359490ccc854a4008a7560f0092ad9f71c2d938
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links likely serve as a distribution point for further malicious activity, such as phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cuisinescartier.ca/upload/editor/file/88478560348.pdf In PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/jotewemavugenu.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/dodesexuzilofovabu.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/54307073652.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/14179494808.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb474d9041---98524123689.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/vixetab.pdfIn PDF document text
    • http://holzweiss.at/99051091643.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/jinazedirigaxa.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/47433589021.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/tikagudedafofek.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/tulox.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61387270C35EB.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/nikufixulufusorasi.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/36964296512.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c1c51225e---85014491551.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/20071330304.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/15188560325.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/2691481454.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2c904fb6---tiwomagexofanokokulobelez.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/80364798006.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130f23ca2e85---wiketobis.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/pibejigus.pdfIn PDF document text
    • http://turnyras.lt/Files/file/judiloguwobojokifivep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=gta+v+mobile+android+apk+obbPDF 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_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 21048 bytes
SHA-256: 1ebf1f130c11b3277219085687dafb837b9187becdc39f6c8fb5810afede0fc2
font_01_sfnt_off0001114d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114D 10720 bytes
SHA-256: f29303f87a0b3515aa112c6d42488fe98ef76a2675a6acb7f647919353392e8d
font_02_sfnt_off000129b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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