Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf92d435814c656…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 09:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31ad5cbbfae6bdb1c68f8a6c2b530aeb SHA-1: 5f8f68bb44cf8eb0bd3d0858d46eb26dd223463c SHA-256: edf92d435814c6564aa21133f6bb62eab5fd6a405b0dd1649dc8e838ccde57ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://solarexperten.ch/fckeditor/editor/images/file/xiburixafib.pdf In PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67e38ea3328af07e7e21de7329365400/mabonejegijuzupa.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/887433396ff9e9e7b352ea48235ed9e9/50083246172.pdfIn PDF document text
    • http://e-district.org/userfiles/file/29156454534.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/poneruzisagijepabovun.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/423ccc8977a794f0a8b0546cd22d2561/bosuxiwutef.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160801a8e09d3a---xogomanolujov.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/40787681660.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/vidijigumadokupawamatuj.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/f8800522e417bccb7a82276fac5944a0/babikitamabitalamojas.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/66008472873.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/46594077263.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/xodulerovidusi.pdfIn PDF document text
    • http://alkanboya.com/files/file///karugokavi.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160782a87703d0---89108268625.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa89ed22427---raloxas.pdfIn PDF document text
    • https://plasy.com/uploads/file/56764951870.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/5c2a8499021be9602979946326efb7cc/46662905948.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/gavalipipevubojus.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fidabexulekenudej.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/xotirelebevuvatisitumudi.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/68784447161.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/63716139382.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/fetuganorakomaku.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/701f23e7deb2ac4bbaf296c801217086/sunixarasazerijulukevut.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021081916233173499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=we+are+going+on+a+bear+hunt+worksheetsPDF 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_off0000cf20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF20 10752 bytes
SHA-256: 6a78aa44d4cc7510399cfd1e6b251a3547c81634a83e0fead8c91d2e62c4b8d0
font_01_sfnt_off0000e7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 17796 bytes
SHA-256: 550d77e4aa7e204bce398cf51b44b916dfcdf311d2a9b320e00e7fad8a440ea8
font_02_sfnt_off00011614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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