Malicious PDF — malware analysis report

Static analysis result for SHA-256 473e8a8c9b86e776…

MALICIOUS

PDF

79.3 KB Created: 2021-09-20 19:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e699b96d12c226cc1b8959108b74624d SHA-1: 73f60daedfed81cb01902c32b094de7abcca7d8c SHA-256: 473e8a8c9b86e776e417f2d8b4fe55555230ef54f2f51e696b7dc5b78d41edca
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The document body was unreadable, but the presence of numerous external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://tingchucontrol.com/Uploadfiles/files/80282571641.pdf In PDF document text
    • http://ewtch.com/upload/files/sopujoxuze.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/61076019941.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/66395049889.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e16b76bc0---7018139538.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/67673879393.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/35053810529.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/9310521546.pdfIn PDF document text
    • http://ombs.ru/uploads/files/26459367691.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b255b06497---nawiwipuxulapewati.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/22756802514.pdfIn PDF document text
    • http://erex.hu/upload/file/wolasirus.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/84854048482.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/ruxemidefomavuk.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/28456131994.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/25627129240.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16148122299f5f---jubanalalunobawixotujova.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/89937257628.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/kiwufudaxewukuxu.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/tatumaruzudina.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fc9e8b742---lowavaxepurapamarit.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/xixupekilolusetupizuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=why+is+my+android+in+safe+modePDF 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_off0000d181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD181 18532 bytes
SHA-256: 52beb7f9ebd1a4410da8bcff29c40b81dab1dbf756ffd73d1d920dece6cf4554
font_01_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11805 10580 bytes
SHA-256: 5d415aac073ab66d08ef2108d3eabcbcd3eda2f8e1224da2d4be9b82fd6c2781