Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cbdbc801301cf1…

MALICIOUS

PDF

70.9 KB Created: 2021-10-11 00:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0c401b5cd5315b43921961c8204a98d2 SHA-1: 3396ab6c9d775709e41f6d7e421a1cb1366e4ca7 SHA-256: b1cbdbc801301cf12edd66b9a11c2b4b479ef406ba3883586670467565f41040
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external domains, many of which are hosted on compromised or disposable infrastructure, suggesting a link farm or redirection scheme. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is used to distribute or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://samsungklimalar.com/upload/ckfinder/files/wevebojib.pdf In PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/52840468781.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210929_FC6C83C4EE7C9E75.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/bitorodedamuposu.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/15137194562.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/56568590619.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/94kb63uh5rud6e1c0phruvs9g0/megugubanevategevewusagox.pdfIn PDF document text
    • http://ge-mak.com/files/60672272863.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/83a9dc8a6e1b00c9c58e274840c85495.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/64059912239.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1616271b038606---rumesax.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/guzabuxutojekuvur.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/zewisa.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/jenoxezemajalaxoname.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/36813097524.pdfIn PDF document text
    • https://sino-islam.com/upload/file/211532145558.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/fajitilesowevub.pdfIn PDF document text
    • http://capableapp.com/uploads/files/zusajebozaketuroxulimov.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/mitedaxivisopadaju.pdfIn PDF document text
    • https://veneziashowroom.ro/app/webroot/files/userfiles/files/14125098966.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/vowepexexefarepamaxa.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/xolugonogalibisado.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/felofaduramogev.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/59e3220526af82c6f9f4b483854d8e45/pofunirilu.pdfIn PDF document text
    • http://taborgospelassembly.com/userfiles/file/melimuluvupojefuvewu.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/71433792112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=another+term+for+createPDF 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_off0000b6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FA 10276 bytes
SHA-256: 3e0b5c31b111eb147788a7c842a6983d412c5db5df94b5f5474b879c248ba8a7
font_01_sfnt_off0000cdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF0 16080 bytes
SHA-256: 95f92487e0d239bdb55beec1fd3dede8ad9ed1a0e1ab4dfeb0e1aa528b63a18b
font_02_sfnt_off0000f620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF620 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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