Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f30af6a56e32da3…

MALICIOUS

PDF

76.5 KB Created: 2021-10-13 12:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 83a00758bd68ca8d98e8c42ed7e9966c SHA-1: e4328261ed619c463ef4a82a43df7938c7360997 SHA-256: 3f30af6a56e32da323064240e1541c7b75390a499f234b279fb54c65e4777325
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4d9f4f264746278b06a7b1f24ae40599/xufivegu.pdf In PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b179cad65---24169655465.pdfIn PDF document text
    • http://parentini.it/userfiles/files/9158280976.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/sesix.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/2042128651.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/ragifotasekubobegafo.pdfIn PDF document text
    • https://najemwroclaw.com/userfiles/file/18191385067.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/bubelubatiloxivune.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/32576249106.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/mobizagugivowataluf.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/dovujul.pdfIn PDF document text
    • http://klhl.com/userfiles/file/xopep.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/91255562086.pdfIn PDF document text
    • http://epplast.com/files/file/tifobin.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/991954a6ca996debc7ffde4af18048a2/kifokukodowotijotiruka.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161570610caf39---fowolajesi.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a9435be2---jedirawibozemudex.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16150761d8c8a5---65920325587.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/nafefenotetalafabi.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/zejedirek.pdfIn PDF document text
    • https://activepymes.com/pub/file/63697141591.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/kq82ll4nf750gt2n4h04q46u05/xobaf.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202110100654089587.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/judetotiwevosiruton.pdfIn PDF document text
    • http://epmachine.ru/d/files/mobabiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/TSvcnjQ06Jg/uplcv?utm_term=amra72%27s+sex+animation+for+wickedwhimsPDF 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_off0000c0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E4 18344 bytes
SHA-256: 083f56acfc721e1817c43f88924c346f51084a473f3f21c9672a2658c3387015
font_01_sfnt_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 11160 bytes
SHA-256: b1c270227c6cbbd6eaf95a3b2874f19f3da9c2d87d04b0f31f2b96243a4ee4ca
font_02_sfnt_off00010a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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