Malicious PDF — malware analysis report

Static analysis result for SHA-256 11bed2b957015667…

MALICIOUS

PDF

69.6 KB Created: 2021-10-04 10:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cba3f49674be6a2d7e06e6f1682f1083 SHA-1: 0653437331280407a8cb716656d9462c5c0eaf70 SHA-256: 11bed2b957015667732ddb256d0f1b78808561a69d72a2ad85c9b1aa7ab49749
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://ukrkarta.ua/fckeditor/userfiles/file/xilifefuti.pdf In PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/12370807240.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/85175998191.pdfIn PDF document text
    • https://digicpictures.com/downloads/62937745011.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16159b857eadfb---gonok.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/25490155781.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/vuxilobufojisun.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b77d77183b---nowebefajuvafejurove.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/76278536908.pdfIn PDF document text
    • http://clingac.es/d/files/89595933780.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/sonarefifotelinorapivip.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161530a0983ef7---25193322731.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210926195633.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/murulogaraj.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/51841510797.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/nisilavemilezelinonimakek.pdfIn PDF document text
    • http://elitacasa.it/images/file/11565165080.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/fiwukemetakukekepaxebala.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b345a41706---walefivumebivemed.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47770300466.pdfIn PDF document text
    • http://kyea.org/imageuploads/6196802435.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490c4ca2128---91667644869.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/df60e820647e6c1bd53d9f98816ffa8e/36457643398.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf9ae2bc4a---mabavejorudinalufugajoti.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16140384f6d1bf---pusofapejinunonosexekeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+twelve+tribes+of+hattie+sat+answersPDF 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_off0000b0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E3 10564 bytes
SHA-256: 1157111725689beb82f322246824e26f6ea8a8f8dbc969f76873b3ec57f26b7f
font_01_sfnt_off0000c904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE116 14908 bytes
SHA-256: 6c4cb9d9bb778cb01288e175d5848e0ae87d285220c7657f77d83de4d4ad6e12

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