Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed91b575a248935…

MALICIOUS

PDF

75.2 KB Created: 2021-09-14 13:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec232e5e681a9dcb048ebec5754f9f55 SHA-1: abb63633639ba673dedb4dfda67c800da6cce0b8 SHA-256: bed91b575a2489350054fc49a825cf0420ce925ba9e5f6db6a2fc7fa258a6613
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristics and URLs point to a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136486c5bd21---nafodez.pdf In PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca27eb0444---55987847235.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/75074099853.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/wazuvawefaduwepatatonatod.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/pafurexuzim.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/piguzidunoxu.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/pogijarasogigesoji.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/xajusodofesava.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa3fvbtlgpirnu5nu9me44d2jg/gedivaz.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/vuwex.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/32278448193.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/578442275.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/d77c6sgb5t0hnrla2t2tfpf1bj/risepasebuvajokisa.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/c9b1bc0603b47ebfb48984142cdaa4e2/44867863515.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gulobamipora.pdfIn PDF document text
    • http://bndweb.nl/upload/files/raxojuvipewigiganizofa.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/36094581204.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/27533920999.pdfIn PDF document text
    • http://sciattella.net/images/file/vedutisiso.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138df557bd6a---36558511060.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/pemuxinenoledetak.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/9254573256.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/badepezas.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/sufakigimusikilog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=glitch+video+effect+apk+downloadPDF 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_off0000c18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18F 17080 bytes
SHA-256: 017b9b435d1a62745a77ef24ff01a1105ad1f7112dda6c2ca74eb9a221a86f1a
font_01_sfnt_off0000edba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 10732 bytes
SHA-256: b42d2dc890d2138ed3c6a46090f96776fd1adb65ff98e5f743de1c559fa4fe15
font_02_sfnt_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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