Malicious PDF — malware analysis report

Static analysis result for SHA-256 49df3ab34e16172d…

MALICIOUS

PDF

73.5 KB Created: 2021-09-19 18:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b897531872ba5ab908364fa9661c320b SHA-1: 5a20fbf7cc6a30107a4fd2958808fb8652fbe666 SHA-256: 49df3ab34e16172dfcfedc08ccaaa0b6fbe37773ba7285198faf81a473a8c45f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of an embedded JavaScript stream and a large number of URLs, many hosted on compromised or disposable domains, strongly indicates a malicious intent. The ClamAV detection and ML classifier further support this, suggesting the PDF is designed to lure users to malicious sites or download secondary payloads. The embedded JavaScript likely facilitates these actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://burningspearmarketplace.com/js/ckfinder/userfiles/files/lulele.pdf In PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf5006bcac---xanemivoxa.pdfIn PDF document text
    • http://mauthietkedep.info/upload/files/67285582360.pdfIn PDF document text
    • http://byecook.com/ckupload/files/30366731481.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/73325599007.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f1e054866fa896ec9ba721416f8ed306/vosixenilexudorojokiku.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/28838714702.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/2820326759.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/7407f3734b25f7bd5cf47126e62920fb/89820481970.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/lutuxagefixujopemuzizowuf.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/gepadanote.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/31403307272.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/l448pf8n61fkrqp10i8l19tq95/zumuzazulinujali.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/rimabuf.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3486345873a3a1f6ad8eef2e1bf40660/24796960.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/xusetapevagusujulokise.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/034f7af33c3657482b103d08aa3cf6e1/mibelezuzodejogun.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/56672671779.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/rifenebakenulun.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/bolemogizawolokewasade.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/gokifikiruzetukumexi.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/54976091182.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/40243907882.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/88554579096.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/32381338817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+make+screen+smaller+on+androidPDF 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_off0000bce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE3 16572 bytes
SHA-256: 12d920ee6ce6efeca8304801a31c3f28a46ca686b042bd476234dec21bc4d345
font_01_sfnt_off0000e757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6E 10700 bytes
SHA-256: 51e19053e3d75e6ea92e3c57a91a67fbaa0d7b3adf4d0fdda624f2a5af776796

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