Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c715de0546c8211…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 07:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 16b1f52e8be61e656a055c4e9fd6f16d SHA-1: 838106390ce11cd565466e0af879ac003f718591 SHA-256: 8c715de0546c8211b37913b547a3749039d88e6cf61e3092ef3ee84651e0ac90
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with heuristics indicating it functions as a link farm pointing to potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=learn+to+fly+2+game+no+flash PDF link annotation
    • https://luatsubienhoa.com/upload/ck/files/4212072675.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a6d4e353855480b2d68210bcd8771efb/pozodejesogoz.pdfIn PDF document text
    • http://theipbuzz.com/images/file/15296257474.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/xidexiki.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e8e42fe14---xofolusamawazip.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/zajisutibakamupuj.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/zoxumilijapovorukad.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/wogeg.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/zajosezajapa.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/rozam.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/filidon.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/lizorenesunuve.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wenugozikalevedigobejiw.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/85253139786.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/94348193942.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/ladawiluvizojoxebegugej.pdfIn PDF document text
    • http://indexone.ru/upload/file/vemafaxupizetaduvoxapigu.pdfIn PDF document text
    • http://identik.hu/editor_up/beliwin.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/74927882612.pdfIn PDF document text
    • http://ternovykh.ru/content/file/domotarikegos.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/xoragulokuwapegu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/brmilshkpbppakccmv9taqn0j1/sewazomifedobod.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/5881348627.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/32068908778.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_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 10760 bytes
SHA-256: 3b5ef179757058a19f1740b6ea3324ad26ec42c3a99f3fdfa540660a0ada33e6
font_02_sfnt_off000111da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DA 17300 bytes
SHA-256: 58084c5932784c9629dfa1aa8b0e0c6e162d6a740151996412fa1571c1490f31

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