Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3d0c3dc30e06d1…

MALICIOUS

PDF

70.8 KB Created: 2021-10-01 03:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 06f213eed2eaceb309b703c3a7d336bc SHA-1: 09e78d4310ba39b87242d77a1f9c8a7bb1522381 SHA-256: 7b3d0c3dc30e06d17de811716c3409925c6504badfba8fc4546fca3d13cbd19a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://szcftz.com/upload/4554335364.pdf In PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/90893213470.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/49109249866.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/99927881887.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/c1a3ca96543efaf4db9d7dae1a825fe5/vopafiwasifixotofeveze.pdfIn PDF document text
    • http://bamor.org/userfiles/file/9022534605.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/37040330186.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/89401868163.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/debelukigomulaku.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/4269923769.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/teviwu.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/tqujrmjchfgu4u7pugij9n8vi1/99092021603.pdfIn PDF document text
    • http://champagne-ardenne.annuaire-regional.com/ckfinder/userfiles/files/58628257254.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/68584187.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/31060036236.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/texutorafewarejudofogu.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/73949794625.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a11641476a---sanogufaratazavujupi.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc8209522e---2262904744.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/7261611304.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/9493639060.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/90027242531.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/pilekodosasab.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/78660918476.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/26223419353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gizmos+and+gadgets+androidPDF 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_off0000b438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB438 10644 bytes
SHA-256: 773ab98e2c9e9e3a2af52e085975f3f279fe5e2fb706a51196ac3c42731be09a
font_01_sfnt_off0000cc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6E 15816 bytes
SHA-256: 24657e734258b8765e4c8c5b50d3ae893756e74404b7a1459e16cab569981bfe
font_02_sfnt_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1