Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba9f5b64416b5ce…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 05:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 37a04e5c154b3b6fb04b55677168684f SHA-1: f80b4a051d480d6d925a48e16f360d4898d2e636 SHA-256: dba9f5b64416b5ce678db301732359803e6599d5e223520a2766f637b8f37065
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites or potentially malicious content. The presence of multiple links on disposable hosting and the use of 'utm_term' parameters further support a phishing or SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=traffic+widget+for+android PDF link annotation
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613045167ac4c---27454295560.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/t1fr19sa0l3rh4u2jfsbkf6ulm/54146265751.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/wibikerewanexogojasetob.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/wejolufivigodilumu.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/bevavosireximorufetif.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/rezafanipovikavifobara.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/88172450890.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/wowizexesexuzisekiwosipo.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/jetuwevuzudiw.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/merogiruzu.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/93497745819.pdfIn PDF document text
    • https://renteci.com/imagens/file/jivej.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/bajaveduwupuvajesag.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/lelotiketo.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/10394602611.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/66521005114.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/20895306815.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/fujijetibava.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/luzuwanojut.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161380e7793525---megatutawu.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_off0000d628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 17812 bytes
SHA-256: 5626a62f17ad82d0cfb361e3e6a7b25b59cadabdf4d006213dbc7b51926650b2
font_02_sfnt_off00011c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9F 10484 bytes
SHA-256: 79a036fe07da58d6d7f7fe951e36d1d18d690749fbb49cfd230a0d1df3149a98