Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f1281481d20950…

MALICIOUS

PDF

85.5 KB Created: 2021-09-16 14:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b414309875ab0e89aca04a7589a62992 SHA-1: 63ef6815c5b9ea5b25f7b70ec19237819423e82c SHA-256: 27f1281481d20950d7dfb1bf8cd72d33ba301707f3132bd2f3d62b18072ca979
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bffcb9398---90465216285.pdf In PDF document text
    • https://ice-group.pl/userfiles/file/pesupulovamavikezujas.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/domaretaxatujoninokewazav.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffd324889c---wuwitojuverut.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/70511464148.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/3330242137.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/tabosuwebogafirixudineriv.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109091252021038.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/bpoc7jui23rilct1d6p6ntu0nv/nelawurefewademugeluvosem.pdfIn PDF document text
    • https://ienter.bg/files/mivogonezubabi.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/3113204297.pdfIn PDF document text
    • https://poker-fire.de/file/zovunitibisodimup.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/20923507184.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/42059751619.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/u5olseb5masag4n2280va9raf5/55108648837.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/jabonewo.pdfIn PDF document text
    • https://cape-electronics.com/media/file/relizomivamaregazepu.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/winupuguba.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/tipivevotukewepupoju.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/87015134297.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/xevofelana.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/29282595169.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/o60857hske3au15tmqdte3sac0/77642441007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=high+graphics+multiplayer+android+gamesPDF 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_off0000ebc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 16664 bytes
SHA-256: 945c083b90678d270fef3a263df004c3d2245771ced8cf9a11afe5d6a387e13f
font_01_sfnt_off000116c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED9 11168 bytes
SHA-256: 77c84be40f1d1a4164cba5e960f950bb97f6216152ae2434e5aecfa9d06c35ba

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