Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0c8b4730f3cd7a…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 04:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 467f032773cc44d521eca391090d8361 SHA-1: be5bbafdff841013a132fbde5c40c56c4bd4140f SHA-256: 8d0c8b4730f3cd7a9b8e95c0cb1a23905deb29fa383b51f80ccdbcbec7c40fb4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm or hosted on compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cbgnfinance.com/userfiles/file/joginamodokonodolur.pdf In PDF document text
    • http://kaithompson.com/userfiles/file/91676264114.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/vewelamiwi.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/29q4qdgfet4r6js5surnorg5m4/zodarigi.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/20767757173.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/26432828679.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5d3900dd4---35131908661.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/2142437834.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49653693885.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/tujogevusikuwiwijafad.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/16124635646.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/59968781002.pdfIn PDF document text
    • http://briztravel.com/upload/files/65239280261.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/sisisa.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/35638820023.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/2003454317.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/dugigop.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140c02f298ae---9651732352.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16317536441028086041.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/3124378964.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/meresuvirexope.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/rusol.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/fumotabusabidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=aerofly+apk+downloadPDF 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_off0000d409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD409 10404 bytes
SHA-256: 4a8ce55ef9bab4c565b28a387118c1c36151d1ac0725069ee8ff19df260ec559
font_01_sfnt_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 19208 bytes
SHA-256: 52fd9a2816e3b3e4ec79fb4983880bd8ec2fa49916e153a289a7b50833b47745
font_02_sfnt_off00011f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1