Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f9d8f6a1006e02…

MALICIOUS

PDF

89.0 KB Created: 2021-09-11 12:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3db69f62f5db114be47ad4e17768ed76 SHA-1: 3df270e701e95e2ca07bfd0ab6c480299e8eb0ce SHA-256: f7f9d8f6a1006e02875318b6a78a3f81db64f36efea39b1daec80fcc0ad30ed4
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further payloads or leading users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://medianet2000.net/amm_prod/image_news_popup/file/54247011814.pdf In PDF document text
    • http://dealershop.es/userfiles/file/76707770958.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/siresipu.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/tuwelukiwapasi.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/5398b447c8bb7157c1d4d335cf243437/50556156874.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/97fa71238d0face81f0433c8be712eb5/farurugabazebudinoxajol.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/23387916012.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/82543356491.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/87762304370.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109110945499899.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/relevoxelefiwotogu.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210906145923.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/66968713477.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/69205200773.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/815578331612f17690369c.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210908151324.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/6088002073.pdfIn PDF document text
    • http://ccsl.asia/files/91774166746.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/1424771702.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/49638085641.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/kinuk.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210907_E070793913D461D3.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/wakologupokabebek.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/ruzunopid.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398eeb24dad---fazunafowokidulis.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/2349627336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=week+days+meaningPDF 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_off0000f87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87E 10424 bytes
SHA-256: 33e71dd2e1acd493f650fdebf838b5e882f6f8e2ffbfce010cf3f840fbcef1cf
font_01_sfnt_off00010fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDD 17764 bytes
SHA-256: 6bd1edf87a17443f41aa23e1391ad77019cb601d95f32b904440763d794fc339
font_02_sfnt_off00013def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1