Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55dc0bf9a27fe29…

MALICIOUS

PDF

139.8 KB Created: 2021-06-27 16:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 540b714e91f1fb68e677e36d07490557 SHA-1: 1d750d67d3675c8f6213328fb269834115e0566c SHA-256: e55dc0bf9a27fe29b813b430d779accad1ad881f9eb005c362e678777426e71e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

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 https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd4d92e970---pezilamomimeve.pdf In PDF document text
    • https://atcotourismtravel.com/userfiles/file/11497226272.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/110643056312.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/sbi0sgldmda030deja8d21ldbe/17241191295.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad70905c42d---femerikidife.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xulovuz.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608098e13d2dd---vuxiveluvotiberekumix.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/205466d660d1906707c88ded966155eb/6175530334.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/47243963365.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/4078c8f5d2adfdb355324fc555e5e05d/98184965470.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/96236678672.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb8df87727---rafuvikor.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd513dbb4ca---71797999899.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/kogebararu.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/buzejew.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce02860b3a---628711304.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d37601e50---33718976273.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/40402381680.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/7a893accd67c35dde35c11b782ebbcec/56172364173.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/97673261654.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49db897297---wejiwil.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/b18d1b0e7c1aa5fc0f3ca4be93d6de31/vupin.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/dotuvipifoxigixizal.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/bef809b1eb398e4415b8f6c8baacd68d/ropidemigeratedowoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=our+mother+of+perpetualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C4 74364 bytes
SHA-256: 75c7da671810826e90fb5c1391b60bc9175495826c37a57b867e5baca31444bd
font_01_sfnt_off0001c55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C55F 10384 bytes
SHA-256: 3f84ba2c76d04184944e54ae923cca1e3eb51eacff7e1e77d5f081915e21e2fb
font_02_sfnt_off0001dce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DCE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001f4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F4F6 17068 bytes
SHA-256: 22d0682b43371e266f5b87e49134af7ca27488cb3c2ed246d97eb236584a30b9

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