Malicious PDF — malware analysis report

Static analysis result for SHA-256 5132ff1b1ee66b28…

MALICIOUS

PDF

74.6 KB Created: 2021-09-20 15:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1d51752c30485f6a949282114fbf10c SHA-1: e35c2e41d56d92deac52547330e322f2d6a4d8a3 SHA-256: 5132ff1b1ee66b2828b608b992d3afbac245ac5f3833f31664b6441e93cf04d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://ketchas.ru/uplcv?utm_term=it+chapter+two+english+subtitles PDF link annotation
    • http://tunesistudio.eu/userfiles/files/wepiwuloposumuxo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131c958b5398---bixovajenufi.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/81583377561.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/6587856061.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210910/file/16312281297787.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/bowikajovap.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/nedokoxunipudoraxigawumed.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161464387a5fbc---guzevofimarukefanunolok.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/tepubipejusenivukilewolos.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e67e2db543---69158543868.pdfIn PDF document text
    • https://harmony.im/userfiles/file/levepogajanineg.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/86137512536.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/gijupewivonobovorigizirol.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/5785191135.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/74600173663.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/299752903.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/litoruvinowejafubetito.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/xevulisivuzuvufil.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/kibatatapijajuk.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/22181234185.pdfIn PDF document text
    • http://sabaparsian.com/ckeditor/files/files/25914553716.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161429b255bb0a---56564370905.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/81030720071.pdfIn PDF document text
    • https://premiersuli.hu/files/files/rutetagurupoxikoli.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/13404690239.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/v9k1opslm8u0t1ijbov6tgtlq7/52056193840.pdfIn PDF document text
    • 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_off0000bfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C9 10928 bytes
SHA-256: 24556cec1b1a8b5e9100cc1b8cd1a42f82781c325a6e1ce8606ad39bdf84d0d3
font_02_sfnt_off0000f0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 17012 bytes
SHA-256: 0aed8cae89a170fc2f4670d3d82b31bf7cc03ae31f8c7a39922bce62df7e5873

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