Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b4f2bedbd69397…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 16:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6616cd3efa9e341ac0e15fd9b7367dac SHA-1: 6b65ba851a569df40953b43dc95cfc821fb49504 SHA-256: 09b4f2bedbd69397406b76f23c1ce5124ba0ce50233657cbae4899a114b77ffc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, containing numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains. This suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://silky.ae/images/bulk_images/files/nogoxotimikegokapov.pdf In PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/41c16d7ffc3ea78baf4126f5863b9a45/vunof.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a4f908a20c---21573600653.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/77bd506dc0cce0707a2d177ff3e701e4/poluxovagixigajura.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/24582904919.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/sipoluninifejafo.pdfIn PDF document text
    • https://vestol.bg/files/file/28854565447.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/xoxezosamosekowijakemida.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/84066678711.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/wovagojogebe.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00aaf8687e---258632439.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/sawafusaxedudonudusimobub.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607488317cb20---69085641775.pdfIn PDF document text
    • https://duel.pl/userfiles/file/15675211973.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/banoboxutozeruvufexuj.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fc0abbc64---99282842514.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3d92e3349977ff1efaa375edc7f505d6/11830410561.pdfIn PDF document text
    • http://rubensova16.cz/files/file/davonilo.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/48755217582.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/dd8e8ba6d994d442a7ef258ee889af45/47101832413.pdfIn PDF document text
    • http://cjatkinson.com/userimages/89403698857.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36a965c089---6944322733.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/97061001531.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161329297a7310---50737894904.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/98459874392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=dometic+3+way+fridge+repair+manualPDF 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_off0000dfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE5 18228 bytes
SHA-256: f1420b5d1422381dbf374a10184cce2926ea88bbc97a3bd6909515f543ad4f59
font_01_sfnt_off00010d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D98 11268 bytes
SHA-256: a20ab6187f7396e733e090af63ae96158b7f6bfee4eda5cc8d0930c87c30d5b8
font_02_sfnt_off000127ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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