Malicious PDF — malware analysis report

Static analysis result for SHA-256 e683b54f40bf5090…

MALICIOUS

PDF

90.8 KB Created: 2021-09-03 22:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d17a64893d372f708c0459b6de6a3482 SHA-1: 2993d3f532bcb28777c3dfdd8b20902da6d1d082 SHA-256: e683b54f40bf5090b24b39f992421d2320050fa9c21867150b6d93eb024ed5f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/qnaf1dp830tak10dulvhnj9me3/6648515842.pdf In PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d5cc46c99---divenelerarafimufi.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608f21d0cd0c9---69858618374.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/61ffff42161c697db52d6aa46fa4fb73/85699483437.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/60999314521.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/16818610769.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/lugate.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/89775327841.pdfIn PDF document text
    • https://hagepoorter.be/files/files/xirexukolexebunido.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/kuvamesafefezegizunogom.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/79842005140.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/73324766053.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/16224390672.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e315ae9de---72518873701.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/ruzon.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/tanilajaregov.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f9bc81351eaedc8161cba63a3b516488/14539402203.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c571fef0fe8---nagoximumogitigimu.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/kogeja.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/60527343497.pdfIn PDF document text
    • http://aimic.com/userfiles/file/setolaro.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/vamirewipuzidedatozowe.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1de85ba01d---82530490886.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a217f3ea6b6---bomesuzer.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/mumimilijufubif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=moral+education+book+pdf+grade+2PDF 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_off0000fee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE3 17420 bytes
SHA-256: 9bd32493ec8463a871ac826ce8061748804e5e96e6929e8b329580d03c457a0d
font_01_sfnt_off00012b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AB 11072 bytes
SHA-256: 9ac56882d14ced6fd988044a3c62820374b5ad5c4cfdf625f9f29b2ccfcf9251

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