Malicious PDF — malware analysis report

Static analysis result for SHA-256 47943c6867fb70f1…

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 12:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: acbaafc80c4d81984446e19e29eeddd6 SHA-1: 40137c64c70a37eb4024617a11018f96a6508d57 SHA-256: 47943c6867fb70f177363619a4c0e4688d2963dc3fb20d4dbcaf581d811a8ee2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://congtydaihai.com/upload/files/45216850208.pdf In PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/9t9ocep31eraidnpp7josvajfr/63242658827.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/7dd98c9334989d0451bd520c2f8772f7/1365678790.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/780f6abf7502321a2385c7f0057a94f4/37947690542.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4627abd578---17717999753.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/58036204809.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f0148ac9d---wuvavifezanagi.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/xekakunabe.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/21849081907.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/jamedonijufinuto.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f9847bdb7---83305017273.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/0b33bc70c279c45e8111012e834223dc/9130207172.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/gogisodadakimi.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/fekowufiz.pdfIn PDF document text
    • https://vientangluc.com/upload/files/52072274185.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/zepibamutif.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096835c9da80---81935350826.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1611d0efd84c56---miluzabitimalasonevoliko.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/4nui4l1h67jn2us24d7pd0ipkr/patatugajevuvifuvan.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/xerifememazigagexemorawo.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/bifofaxesumebopirusimu.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/wikugixebevaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=intel+8255+microprocessor+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0cc17adf6500538098926e9c982d4c54/25426342429.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_off0000de95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE95 17364 bytes
SHA-256: 0e25e2005fbc9a8965f963d7b9a1275343f65d8a1084866da2f314c752cc86e9
font_01_sfnt_off00010b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001237a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237A 11032 bytes
SHA-256: 254c1dd34335c709dc7d9ae21fd47f81963fa6a9226ee17e8d3fd9be27ae30a6

Open this report in the interactive analyzer, or submit your own file for analysis.