Malicious PDF — malware analysis report

Static analysis result for SHA-256 835f0ba62518db8e…

MALICIOUS

PDF

91.2 KB Created: 2021-08-15 20:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3aa168263ba237713414de4983fe553f SHA-1: c191f813c40448ffee2e197d2f6a5b17e04b2b2c SHA-256: 835f0ba62518db8e42512844eaf269454ad59cf4055b99f984e129ed343f8ad8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=did+rin+love+kakashi+or+obito PDF link annotation
    • https://nergizleryapi.com/image/files/vodibasixonalipeja.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/23589631271.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/bojuzokarebeka.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba39473df7c---xenukenapezerumamerejub.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/18242023033.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdc98b6aeb---nopumapodurotibi.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/35762034236.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/voganesefalix.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/59082999469.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/5604108910.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/gonusozimofutebesume.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/baeec9860ed5075d307462c8f6c31656/64267509558.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/kekowurotufu.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f661214b5---72505601012.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/94435187850.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/vagosapuvafu.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/bukumetesan.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16104b39b1f294---sofuse.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/lowupazimofi.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/7e912e60c1d19e594de729f969da2106/26733787129.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/9131244519.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210615193649.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/93016686057.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dee3a0cf55---5092130329.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_off0000ffa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BB 10644 bytes
SHA-256: 204cc7cef13d1ad33391a82d8e6922300c220dea5f2466b8dec5f2348d1a8db0
font_02_sfnt_off00012ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFB 17332 bytes
SHA-256: 0f1f43484e3e37bcfc41cc8ed34d538d5f6d6b6d59c1ec9c801a33fd47d13dca