Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f35476cec24999…

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 14:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dd199bcd09dc52850b218a94abe44ec7 SHA-1: 74019de51beec84f61ca39b04102f8c2f84d3a41 SHA-256: 13f35476cec24999bac7435ea09a0dc9fa11f6692a63672382b4b1ccf3243c3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely to distribute phishing content or malware. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=leon+battista+alberti+ten+books+on+architecture+pdf PDF link annotation
    • https://citytrafik.nu/images/file/jubuno.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/cgjcd40523dbd3r412e8ir06e2/12255206663.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/98af7fb624e54de1f4233181c99b3f5f/paraw.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcc7a76aa6a---minemubotivirokuzutuf.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/79887816761.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/tolotimosukomizija.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/52801079346.pdfIn PDF document text
    • http://hoskinspugs.net/clients/40498/File/zaxumaxot.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb9d596e8d---42449009952.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b896dae9829---45979141245.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/vuluwurigawalekelavulege.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a14b90cdee7---18932156624.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/12016587694.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/safedetonafutakefi.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/024ff214b22ba21c1d7d2472976c07c9/sowamimedagorijojudug.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/likoxebasosini.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/tarusosu.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/55268740939.pdfIn PDF document text
    • https://purefeeling8.com/data/file/39631400364.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6fe28a867---82835962369.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d74a70d203---63956521973.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/logifufarigar.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/c3bde75f97514283bf15e83381c23f66/tivuxinix.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720c2e866c2---bowevile.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210818215610.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_off0000dc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 17752 bytes
SHA-256: 5d743c67a5de0b39c058532baa6bb68655d524b32f41e3282bbd20b939a37acd
font_02_sfnt_off00012260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12260 11008 bytes
SHA-256: 81e6342bff0f1ebfd147bf9a623a32cac04767963f0eaac75a92358d368a10ba

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