Malicious PDF — malware analysis report

Static analysis result for SHA-256 5491679249682432…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 00:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 001694ada549e99fb2054dc02c077963 SHA-1: 68944f0e3cf26d289229620eea24d013f1642058 SHA-256: 549167924968243247bf2a1716361e31ec1e50db89eb27da324485d815d24502
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on potentially compromised or disposable domains, suggesting a link farm or phishing lure. The presence of embedded JavaScript, flagged by heuristics, indicates potential for malicious actions within the PDF itself. ClamAV detection and ML classification strongly support a malicious verdict, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/novunavoperinevefab.pdf In PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/worigodevupezunadarigex.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/935cbd311b40e3e026571ef516f73c79/50542687202.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/74251917183.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140909b12ac3---17043222302.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/gevurufivi.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/vozasepiveditulaf.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c662d1b29---sixibidox.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/bd42bed4a470dd3fe6af4512d148e222/soref.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16137bf468ea88---68380219082.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/gemodetolape.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/xulofov.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/zesididutiwopiwopi.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3d40038defa95640507d5acda5957cd3/37219906980.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/zubilifisog.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-25/20210925045643816174.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/59770929663.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///32142402925.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3485dc1b9---taxorigenibelus.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/fupov.pdfIn PDF document text
    • http://haai.org/upload/file/wokuxagivoxop.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/paxozusawararulug.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/87498810602.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/59839296031.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/zusizipamekilo.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/gibapakakezipine.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/8470477763.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/pewowopor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=gta+5+cheats+using+phonePDF 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_off0000b817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB817 15536 bytes
SHA-256: d8130161adaaad1e561c26a5d54dfde9be89597d9acdf4c4cb72adbfd816d37e
font_01_sfnt_off0000df60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 10780 bytes
SHA-256: 71cd7343431e973de3001e3648108e670b4a607784d410e1a5d8f6194bd18122