Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdc5351e7a00172…

MALICIOUS

PDF

87.2 KB Created: 2021-09-01 21:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: be3e97fca120a1b70de667a9b87c7176 SHA-1: e7dd64da160414ae255826ab3d13c774f9ba8bce SHA-256: acdc5351e7a00172d50ab3f191bcbab1714b538ae4f5ee32e58945b8f60671a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious or phishing content, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c3f61933cda---44901340182.pdf In PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/mekamunerilux.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b54d4c6bd4---94968118396.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/wonobaxa.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/vumagutukub.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3dd6af8c6---67576353884.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/5295683021.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/48954810386.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f91ec958bc0---tozigididafobupekuki.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/dudisulavibuzadanipuzu.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/futusuwameravikawavene.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39809514781.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0b3dd2b42---puvimefeduvawelerew.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/vodagivevepetodejomabe.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d60b553102d---80997518513.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/xaroratulenevilete.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f88bc5d27e---7525054131.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc37c8d90---ronorufamonaluxevedetu.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/64865007716.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/62983481473.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/74197177167.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607405f351890---kabedewupumajuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=copper+ii+chloride+equationPDF 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_off0000ec9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 10720 bytes
SHA-256: 786cc4b0de4e415a10d9e29d37e01951fc3c643f8aa1a778c44c111cef553317
font_01_sfnt_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFC 19300 bytes
SHA-256: ee9d6d7197c49b17704909b36e059b00f9a57be581927aa415bb891eba481588

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