Malicious PDF — malware analysis report

Static analysis result for SHA-256 882f56383d1e3247…

MALICIOUS

PDF

75.5 KB Created: 2021-09-26 00:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38d506466d0cca6d33d00c5fb3be8289 SHA-1: 928989e23254e983820e7cea1638c4590bc45231 SHA-256: 882f56383d1e3247f1be518eda958cd2536ca6b39a31cb317fc2ed254a4496f7
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to deceive users into downloading malware or divulging sensitive information.

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 https://ketchas.ru/uplcv?utm_term=vsdc+free+video+editor+apk+download PDF link annotation
    • http://kingswaytyres.com/project/kingsway/uploads/file/jonukap.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/9300784106.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130630463820---mawufizavajexawojuporuz.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/19761754024.pdfIn PDF document text
    • http://dongphat.net/upload/files/81868941293.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/pufarare.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614056eeefbb6---69461462655.pdfIn PDF document text
    • http://nanopena.cz/upload/file/bukadijanexuzawapapaf.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/timejebuxabufanupagisoxej.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/74313259559.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b71eeb854---wogivukemuxijel.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/kagakagojomaz.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/81558745868.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/furomekeka.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/vanamu.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/19741655296.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/gumomuwobo.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/31960659858.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/tiverojafokudubasad.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/ravanijefalinuwugebej.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a0d4aa5d0---menule.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/zigalojorosixevuzepet.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/betefuzet.pdfIn PDF document text
    • http://bndweb.nl/upload/files/14618773045.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_off0000b88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88D 20484 bytes
SHA-256: f4724e42883a5903bc4c1bd349e51395994f23766432e86a0f5fdd3d496e5cd7
font_01_sfnt_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 10824 bytes
SHA-256: 3281c41bd2d23deaaadb877c5823d3dd46b779dfbe7ee44375f0ddaa66590792
font_02_sfnt_off00010624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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