Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f7eb5a5c04ec12…

MALICIOUS

PDF

79.6 KB Created: 2021-09-08 09:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dd30e269477d3b8e7fa84aa8e26296bd SHA-1: d0f34ddb9b9f05a540694152672d4435a321de90 SHA-256: 26f7eb5a5c04ec12ae7523e11aedc02b18d85507efc0a159a2e6ddd26fb2f4d8
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The PDF structure and embedded URLs strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crewmak.ru/uplcv?utm_term=coronas+de+zirconio+pdf PDF link annotation
    • https://adian.eus/files/galeria/files/76153782260.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/r76i5heumr09lfhq7l513ih9n3/83083584695.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/83n9arvan9t0qm7ch903af0qu6/lefuxalidegu.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/68799970980.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/51b3448125d9067448e2995b38a9e501/pipewukufo.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/giwit.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/zogawu.pdfIn PDF document text
    • https://hgb.se/filer/file/rixaxeji.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/fikuponowukun.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/vikugavixotitiwonegu.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/52893105282.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160cf53f81c9df---dojavavedazevokesunivuloj.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077cbe6ec08a---91043058692.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c3dcf211d---51493539870.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/6a8a22a7561906599cc995ce24dad9b5/dujuwekijinijafe.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/gixobupijopukuse.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/93855295084.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/07/figikiwojexovaxu.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/51456432673.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bec04c308---62978035481.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/8609889127.pdfIn PDF document text
    • https://ksuskalology.com/images/file/58368861886.pdfIn PDF document text
    • http://hondaototananlongan.com/upload/files/12375803901.pdfIn PDF document text
    • http://findusafranchise.com/files/files/70408873976.pdfIn PDF document text
    • http://dienmattroigiasi.com/uploads/files/titapawewofamutosebag.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_off0000d29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29E 10560 bytes
SHA-256: 734a8e919d82697c9928c001b4af8fe644f9ac5f9772f6e904428d9ef7c2f555
font_01_sfnt_off0000ead2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD2 18096 bytes
SHA-256: 12b300162568431f58addff4ce9f59841cb76944509dcf578c4009834022c715
font_02_sfnt_off000118fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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