Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc9cefdab337bd8…

MALICIOUS

PDF

84.2 KB Created: 2021-09-20 10:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b00f9dc952d60a4e0749529320f8f657 SHA-1: 076cb560a7dc0577fc5074875941248f3f280aa3 SHA-256: dcc9cefdab337bd8b66ace61fc4dbd1331b69194fd503a3cc2e38550d50fcc1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The presence of these URLs suggests an attempt to lure victims to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=how+to+uninstall+outlook+app+from+android+phone PDF link annotation
    • http://geostudio.eu/userfiles/files/doporajipova.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/vupetejafo.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090214324539.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/sifepufobamiwafulef.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/rabudusasu.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/vutirisama.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/51ac9341a4d02d910c3380d571be1e2b/81099584372.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/xatunuxisobipojizisoj.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/8fd8c2bc75c4f1010aec0a7f47da1573/68340308410.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a02b75d7e5e6b4b8c118b850b3d0cacf/965272129.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/tavizanoni.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/46441744744.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/suwama.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/fafilofevirab.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b46c7f2f4a---40877181981.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/69478939117.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/gonutukusolakule.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/pidada.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/55703797531.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/nutir.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/38638792825.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/bb939eb9fb88ee1bdaf5bd25db0f3858/dedexelolikenuzu.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/lusamovolefajinowi.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_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 18760 bytes
SHA-256: 042652241443262bc698eed0f853b304b58dda1746df6e976dea81dab2d92c5d
font_01_sfnt_off0001116b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116B 11032 bytes
SHA-256: d07c276bb7adcfe28a3726d82b4bab00be851f8d5eaa69f94ba47266119ad3f1
font_02_sfnt_off00012ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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