Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f746a96410575b…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 04:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2bb5d3f2b2359c56c66a1f976557f11e SHA-1: 0eaab27b729b4de93999c309e6971be028650fc5 SHA-256: 35f746a96410575ba829c6787ce7198a711ceed7218a2205bd30efd5ad6e3e12
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thrifty-uy.com/files/others/farokufiburezop.pdf In PDF document text
    • http://noahmission.org/dataroom/file/40526903957.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/70043727158.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109062317305393.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210907160506.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/xerusugowabogutupix.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/lisonenog.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/91404852132.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/jibibuzogebifawazemugon.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/nolemigadokusexed.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422ebdb78b3---telubiz.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab534c9cb---rexeguzesedegixovitun.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/58093269659.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/mimabulav.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/laboxax.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/guwukasagif.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/48347517204.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/61586847045.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc206e82c7---dazarin.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/22760436769.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bf3377671---tojuxalafuvenokezevir.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/26e8a1e16e1289fc91915d1e419d8c35/jexewagemesavubuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=reset+m8s+android+boxPDF 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_off0000dbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEC 10860 bytes
SHA-256: f4969c631ba50d6450f36d14e83beeb077fed609e0a10cf64f7d64bad284e0e1
font_01_sfnt_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 17212 bytes
SHA-256: 5dce57aa81ea88b030a6c6d0e65d399c1d2b276ae576616740cc3085699643aa
font_02_sfnt_off00012194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1