Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf311ba4297b2e0f…

MALICIOUS

PDF

101.9 KB Created: 2021-07-14 10:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 83426f73eff13fd4f4674b1fc22db9bc SHA-1: 35385731c9fea0c2b869c042cdb2a27c341f29df SHA-256: cf311ba4297b2e0f352151a950185e35be2d586f166849ab0f9b030b2edea24d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://huntic.ru/uplcv?utm_term=6+minute+timer+for+kids PDF link annotation
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/uok9ecpgualbq0nmm068a6jir5/gomona.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/17c183f779e910b053fb3c35ae13b818/jidujikawazulevenubun.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ca648a58---49944986814.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/rqi46rd9gh1bn3mtthgvd7o1d2/romexareteguzirago.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d52d0205272---56161393874.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e6a6d2004---68220467768.pdfPDF link annotation
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5f4d6867d---62857359442.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/66486979878.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/7201036245.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/teguraz.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/wisekap.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac097621245---76651026154.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e8df54634eb---tuxin.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079fc3184c49---simunijulemazopabusagaj.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/bagopavot.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae316a5c3a---lunigarebasototisatus.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/migelixi.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9d59ee5975429704040e1228438c9ad2/pewewidajerikanekuwivoro.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/vofubujifukozozas.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/6566321800.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/tlkjfd4l333jfrqu38tsa2nctf/73929997144.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/mumenuromodu.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_off00012e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E05 10568 bytes
SHA-256: 601377535835cc0d96018074f27780007666b0f53a99f7a305da53819aaac534
font_01_sfnt_off00014620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14620 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E32 17136 bytes
SHA-256: 5edb6a8173f70aa2678c5e8d5a9133d908563acc82aa4d83f7cd43e14ffd498d