Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8add35ea27e6ee5…

MALICIOUS

PDF

70.2 KB Created: 2021-09-19 09:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b44a2885099fa009f9d8134b41c9e50 SHA-1: 3eeec185201bad0c1cf96b4c6565db3b52842633 SHA-256: d8add35ea27e6ee5cb8938f8dd67e9dcba83d1a04a1841f432e9c1c996db4c2d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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 http://lexus-custom.com/js/upload/files/17866928974.pdf In PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/niveripo.pdfIn PDF document text
    • http://potya.com/zaxobu.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/19089685606.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e2178b32e1717f96761d122b6c32f0ef/bovinufinurupixixumo.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfe647fc1c---58274251678.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613075c08a92f---43442270607.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/26287990904.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/62466319931.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/18970841202.pdfIn PDF document text
    • https://kawanmto.net/contents/files/83777451224.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/47533636797.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/ligufoxotujiwudifasovoru.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/mokogezijobinuvasejanam.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed42bf17af---desavijurasuxabubaki.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/betaligege.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/20653544979.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/vezepakuzaxobu.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/vuxegenozovu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16143a4db3d611---65908313699.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/siviziw.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/zepajutupexize.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161459ba38f901---31625181132.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/68357728413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=watch+do+lafzon+ki+kahani+full+moviePDF 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_off0000b4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F2 14672 bytes
SHA-256: 0850f2209eeffa8ce22ec1a768795551302d63a3f3b719ea54c3b85251595a32
font_01_sfnt_off0000da40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA40 10784 bytes
SHA-256: 841b174814a9cb921e7c603450405e4b5243ad5cb5657af325ee3dd9e1ea4836
font_02_sfnt_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1