Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c4f1d776f8df45…

MALICIOUS

PDF

80.2 KB Created: 2021-09-02 07:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 5c028557fec8c10d37898413dc8aeb75 SHA-1: fc113b033d2c06e3c21c9756f5fde5faee80d09b SHA-256: f9c4f1d776f8df4530034380494a29f5e6ccdc4e9563fff53694da43fe9be8f9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised WordPress uploads and disposable hosting. Multiple external URIs are present, suggesting the PDF's primary function is to redirect users to potentially malicious websites. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://irlanc.ru/uplcv?utm_term=civilian+space+travel+cost PDF link annotation
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/ruxojijiwek.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210701001145_gwa4ti.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160727a3aae2c4---kajininipojeromugoruv.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/sokemulelasosilonumilizu.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/30206791920.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/u6sgsgmg4egritvsngc9n5fvo1/sofelunuvakipefidetijefi.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/70330274277.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/fiboroninalimusebosigag.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/123463b130b1fd3ff51930459d48f4f4/55958335460.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/21924088121.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3abc8879b---soludexetitilu.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/73968003346.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16087b86384594---xuturavefemuxiz.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124145c92af2---99272177812.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/moviwutewubexolisized.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160862ae559924---35378527513.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3cc7bb7f4e39717b3e43d9f4fc07e8a4/fumavolazajomosivil.pdfIn PDF document text
    • https://businesslife.com/content/files/noxajufulowexi.pdfIn PDF document text
    • http://shesob.com/file/files/72420576419.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8d387d6cd60d2406f759096d98764fcb/6778508611.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/wopudiguzorer.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/solikaxewewanutum.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a689e9cc7ed---sokobu.pdfIn PDF document text
    • 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_off0000d958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD958 10464 bytes
SHA-256: 5d0a6f508d211cb691d15854ca2fc4d5467292237c2cda88fc3d80ede2330fea
font_01_sfnt_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 16256 bytes
SHA-256: 2292f672a0b4413dd4ec2ca09b452c9cab02e9b5b5f606d91f8c41b5d87d1b98
font_02_sfnt_off00011b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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