Malicious PDF — malware analysis report

Static analysis result for SHA-256 2adc8cd883eab2a4…

MALICIOUS

PDF

84.0 KB Created: 2021-09-13 00:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 66a7274a39850d4443e9a5ed6be6055a SHA-1: 95c4234cffdc3f120f4284e266e7e7f84d181b26 SHA-256: 2adc8cd883eab2a4824337c15277c3876888d0b69717fb77de2452c9c3f9acbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution attempt. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, designed to redirect users to further malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://lerucherdesanges.fr/userfiles/file/gixadurawoba.pdf In PDF document text
    • http://e-hematologica.com/users/file/68896885084.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/pg5h37h4t6rald2u8rntev2966/3819848683.pdfIn PDF document text
    • http://feg.vn/uploads/files/89890173786.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/lovunowositijuru.pdfIn PDF document text
    • http://bold-iot.com/uploads/files/202109111045473303.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/63486939375.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79360040617.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/50822070956.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/lugeradizikudo.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390ff6cb27a---luwojazaleremalam.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/3758410040.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/gepasegejelaguwafutif.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/lamoxamotimeseranog.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/92729008749.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c7b688e99---likurokokimotu.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/buzuwowite.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f77c1b5a0b---fidixigoxosisakubazi.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/wizep.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/namikadonaja.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6f01e072b---98512577374.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab8a631f6---zugopimukuleman.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+turn+off+app+suggestions+in+mi+phonePDF 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_off0000e112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE112 10936 bytes
SHA-256: 18ee956f2e986cd802430bdf56b26650029907aa1df2890cf18fda6e6840084b
font_01_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 18396 bytes
SHA-256: 016e475bd496ef4c0fe49782217da77fba6ee2486b409118597c5fec74cc3bcb
font_02_sfnt_off000129f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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