Malicious PDF — malware analysis report

Static analysis result for SHA-256 df525fcfd42f0a84…

MALICIOUS

PDF

71.4 KB Created: 2021-09-11 12:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1f84e5c733d18de9311412d1f6a97ab0 SHA-1: 3394116ec80f7d300d4f32cf47581b97fa3b514e SHA-256: df525fcfd42f0a84732396a9e3b9c74620411e795999f0a02f5055e2ada33b06
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to lure users into clicking on them, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=betty+boop+wallpaper+for+android PDF link annotation
    • http://olsztyntransportmedyczny.pl/userfiles/file/67471217996.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d14d0a25---betutubur.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c546d450f1---2662744384.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/rozulagusagenomet.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/77029807984.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/66803709835.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/34866388976.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/navelawapivaxojiderixabiz.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c166810621---fekizikopowetefekovutepok.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/12198513640.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/49392887032.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-2/20210902191609823875.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/36497242389.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/96493950772.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/18834346940.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630808184.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109070652354945.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/jatunugule.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/60988195312.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/derifadujod.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/63076859110.pdfIn PDF document text
    • http://hijoin.hu/editor_up/xatodebisefofotakax.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/nadukekidofatadevazonofex.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_off0000b371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB371 17284 bytes
SHA-256: e27e2d259c5ad91e60cfdc98d51f086982025ae0eaa22e057b658d7a85387f04
font_01_sfnt_off0000df43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF43 10716 bytes
SHA-256: adb9bc0dfec2755799df506db35cc8e9f86df1a39d999e2902fff7c5baa21a85
font_02_sfnt_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1