Malicious PDF — malware analysis report

Static analysis result for SHA-256 6412e4f01c490cd6…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 23:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6aade8ff47713954e468f81329314804 SHA-1: 3f316df811047b40395b41dec9bfbaa5431b00a8 SHA-256: 6412e4f01c490cd641f9ba10f4df9508f2e198a11ad8b5dd0d18b63e41b8916d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://ourhkg.com/UPFILE/userfiles/files/23665906226.pdf In PDF document text
    • http://msinziniering.com/userfiles/file/34932963383.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/levogutupen.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083674175ac2---86633809707.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/46947304010.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/vusozupatatugav.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/66684295636.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/59410281255.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/vabadakivutifunoju.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/n37q1oqouiphmivh0l4av5hcsu/bumubofojunakibadetibuj.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/ralafinovobupowovoziriboj.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc76a3b079---molikeguw.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/sekikebebuje.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/88158864365.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/61746ea14ade355cd797a6f3d3e1639c/kexatipolojidujo.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/bamofawixepi.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/93751452096.pdfIn PDF document text
    • http://fields-on-earth.com/tivotubudumebiwidufazimaz.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081f17173af2---8922583083.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/3d189aeba151b754999b591d3ad89185/58858269221.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/90892429818.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/newixedalokemugi.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160acb8aeed9d7---23951708623.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/17534325696.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/fovufaxutowakotega.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/21062440374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=endommagement+par+fatigue+pdfPDF 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_off0000dee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 19272 bytes
SHA-256: ac79c7677102e7317a17c0e9413bd7f3aa720de2c5cb29998904d0714ed7b444
font_01_sfnt_off000111a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A1 10712 bytes
SHA-256: c6151bbcd016fa4a810e78d13d23b1806185711ff0a2e995dab795a85551f157
font_02_sfnt_off000129f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1