Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4f75491a025995…

MALICIOUS

PDF

86.1 KB Created: 2021-09-04 17:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a2c4f6c2f58d10175460696ffc0dff18 SHA-1: c236987ef8ff69f71b25e710ec147742cef5d91a SHA-256: 1e4f75491a0259958ae19cfc15f791447404ade8e6e6747f9972bb070e674da5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf95b7bfcf---wipatigowulomoxom.pdf In PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/78922104728.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/31180778360.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/783f21bb1f48f0838563589c930c9c32/nexopupaxugogi.pdfIn PDF document text
    • http://garderoba.sk/images/_file/visifudoguwinozuzew.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/82369475014.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/vikumagupolenafotukeriji.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1625468954.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/99b8c72a51147c96528134569075f62a/sofiwetowupipuxadarutuj.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/49681639093.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4a7a6a00c---jumume.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/256b29e05bd6fdfd78ff088b6f0516ea/92826450020.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/veguzenorogotuzegaz.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60fec9e76deba.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/l4enr2ssn6b9ak7btjdeegqga0/lifetozalodemidamugit.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/noxajazuwevi.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f1f788953c4---38542794852.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5d29a0383---nefujejexifipexu.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/72639002168.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/samaligavimilaxud.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/zudorolujovuxizodogo.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/17237526280.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c59de7a457f---48868801287.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/60022b6ccacc109b0d7c69c94d509f22/79956782146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mahalaxmi+stotra+in+english+pdfPDF 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_off0000cd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_02_sfnt_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 20064 bytes
SHA-256: e421d4dbb54dd5eac72eba5939906c8e48ae113dabe4224d4112634ebccea6b8
font_03_sfnt_off00013096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13096 11040 bytes
SHA-256: 15c77faa0e6d439348efebf6e0adc0e7e6a4da7408219ee6bc07ab8dc5d70c06

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