Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a589904e3a79419…

MALICIOUS

PDF

71.5 KB Created: 2021-09-19 03:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a73a43302066352b3980ef3450af498b SHA-1: 880d8a740bbe5321a1611883fd4215c167b97d8b SHA-256: 4a589904e3a79419ba0337958ed7a949767f2a270d278bcc57cb585e7d384ccd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or malware distribution vector. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

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://esipro.be/userfiles/file/60171150839.pdf In PDF document text
    • http://cardealer-space.com/js/upload/files/1274206850.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d07bc37b63---tofawolisaga.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/93889098578.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/18726592460.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400923859ca---2013726294.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/89317909212.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/13387876639.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/golaxosajodekiladut.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/kelubusofuju.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/929768e7e8dcb8ecc14ca73f3dbb3dbb/tudisalilalujerox.pdfIn PDF document text
    • https://ekransamara.ru/files/xubosejepa.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/ziritazajukoguweramerowoj.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/xomexib.pdfIn PDF document text
    • https://langumeistras.lt/i/File/wotatifamevivituwukavaz.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/24256181331.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/nozadesemamamezi.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614549238f5cd---95880973288.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/1fdalb3qvoopasa9vab0t788ek/22577132925.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/gukonejibefot.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/13810152748.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/zenoxamamajuf.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/dewuve.pdfIn PDF document text
    • https://davnosti.ru/upload/lutulakefivuwur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=roblox+player+homePDF 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_off0000b88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88E 15816 bytes
SHA-256: 5d08591d244e6dae0cd447068fb662d9541f77b67cae3251e283e208921d3eb9
font_01_sfnt_off0000e0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 10456 bytes
SHA-256: 8cd60b208d23cf589b27dc378a9931df39cd465ff333ab1e0c24f22fbf1898f2
font_02_sfnt_off0000f86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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