Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4da9a5c103a6db7…

MALICIOUS

PDF

89.4 KB Created: 2021-09-10 17:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0ea0273aed0d4988c280819a5e90dffc SHA-1: dc9567fc903c046bd16809e4240fa6ac94608ca5 SHA-256: a4da9a5c103a6db7d24075d75307e7c84f0795077fac81b6697dd1c8fc4549cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs and link farm patterns, indicating a likely phishing or malware distribution attempt. The presence of compromised CMS upload links further suggests malicious intent to host or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=best+android+blackjack+trainer PDF link annotation
    • http://radio-salsa.com/php/rs/filesupload/file/35642227793.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/10420424335.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/wadofujaguwoxupoj.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/91481345223.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/94755526879.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/kotaxofoxenilalonal.pdfIn PDF document text
    • http://balone.net/_upload/file///zozinujopijogewid.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/47178995648.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/29617426184.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/wamife.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/retawavixozupusiguxobevot.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210909193617.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/33124830828.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16139a584767df---davuvuzubopex.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/podizipegasilonudof.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/kubekezozon.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fdd8ef243---61985956455.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109082102124628.pdfIn PDF document text
    • https://thietbigas.net/media/files/dusepisifesufobuba.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/javojor.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/47381374660.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/23587556741.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a6635d71a8536ff5448600fb01aebbda/66965399255.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3d79309ad---vufanesus.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/28260869431.pdfIn PDF document text
    • https://ubranni.com/uploader/files/bukagolitufinatig.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_off0000f7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBE 18220 bytes
SHA-256: 80dc7056aa17250c2980c7f5dc58915ce36b3ab63452ab7615845e67f059ac35
font_02_sfnt_off00013e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8D 10776 bytes
SHA-256: a49264d8c03898abbbb6367a8ff98daf14fd11b9a8ebab60fee987846cc4c9b5

Open this report in the interactive analyzer, or submit your own file for analysis.