Malicious PDF — malware analysis report

Static analysis result for SHA-256 b713deecc44e52c8…

MALICIOUS

PDF

70.5 KB Created: 2021-09-19 09:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9bfab2d34d8a000c3a1662972142e84f SHA-1: f0f4e35dc446833321df01007f238f26dbb3698a SHA-256: b713deecc44e52c83e191f0ebf84234a539899d174ea72b6121f63685f513a79
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external links, including those hosted on compromised CMS upload storage and disposable hosting, strongly suggests a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=advanced+engineering+mathematics+9th+edition PDF link annotation
    • http://tofuyatogo.com/uploads/files/nojerow.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/5835729893.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/25133731032.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/042df89d8dcc2f298d65093b7f694b19/riwojasodipavosukixilidu.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/zejetonowosinokafuju.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/39380461248.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/pakixezigenizalifizej.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/37883801123.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/80743534549.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/57056222395.pdfIn PDF document text
    • http://protok.pro/upload/files/19975199256.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/fizetuwakuz.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136c583af44a---39190656862.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/38565207119.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/11241810457.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/34841778084.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/gotefamu.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/28486874568.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/48668399551.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136be7cdab48---xixojurabuweti.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/xikifeponizur.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16143041fadd86---duwomijulinerodired.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ddf5efc610a27bfeadce84a75adb2aac/bakajipetufeso.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/21579533173.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_off0000b526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB526 10988 bytes
SHA-256: 9aaef3a3e62d939c7c095288dd6b144918c548b5905e79a4ab8dcf0f1c7e8cf0
font_01_sfnt_off0000ce66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE678 14988 bytes
SHA-256: c76264abfb849421d657eca4b1db98c525103fed46f6b43e729927633408020b

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