Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c86f3d2a0a0cc30…

MALICIOUS

PDF

94.1 KB Created: 2021-08-11 18:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7a2840435062d8ece70dbce7a575c606 SHA-1: 641d5719a3133625cb6091449141c3f27eb31f17 SHA-256: 8c86f3d2a0a0cc30761a02ec97729de0286571140e5b5eb46deb2c8b0d81f761
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress sites, which in turn host other PDF files. These PDFs are likely part of a phishing campaign or a distribution mechanism for further malware. The presence of multiple distinct hosts and UTM parameters suggests an effort to obscure the ultimate destination and potentially leverage SEO for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dde1f0dbdf---wutipetikazomugovusisofig.pdf In PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799739a26dc---26163996390.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/e3846e3071dd35d090de53bcd8043895/45534142922.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc47493387---towilemobigikilegugize.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/e71ucms7jmhvmfip3pib5iluf5/70549767617.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/xigivojemuzeduwirawazo.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/9f8cb003df0febb27d79539c1ac53a87/44602424108.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb68928a5b8---66739435041.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/wolubipesimudaro.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/bejugefamofi.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/9e5dc9fbf5f58b28a873c192fa43c9b5/4494165489.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc8ceb8b1cd---xoditibofixoronifonaj.pdfIn PDF document text
    • http://okun.su/upload/file/xabawi.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/39211034440.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/82936953406.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f0a0d6ca3---20150839623.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/pewikisanatanen.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/814223a587b5a4274c8755dbf5fb04fa/98613902817.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/gamakuzazetuvumiwulitaman.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074022956baa---74781857971.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/87080038198.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/gadin.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/7176460b303fbddfda82d4f1d8c5baff/70631991517.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1242b7d16---lofisuwibibaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=aws+solution+architect+salary+in+indiaPDF 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_off0001091f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12136 10748 bytes
SHA-256: 4a7e462e5531cdd923065b6b623bd733675dd6f4bfcab489d01823b36d24d492
font_02_sfnt_off000139f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F8 17476 bytes
SHA-256: 7af0093e80d7ee2abddb0932694a86b7e27ee54a61a9947c63859cfa83cf6139

Open this report in the interactive analyzer, or submit your own file for analysis.