Malicious PDF — malware analysis report

Static analysis result for SHA-256 39725343d84a1675…

MALICIOUS

PDF

80.9 KB Created: 2021-08-27 18:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 72c8dfbfaf58e708845ec18ea4bd599c SHA-1: 5d4bd35f3ec9e03ce7921e1efd35887f071533c5 SHA-256: 39725343d84a16751039fc8f77953f92224205d9bde361e8b243982271fe97e1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://prolocolidodisavio.org/ckfinder/userfiles/files/79702755254.pdf In PDF document text
    • https://12shio1.com/contents//files/wosixafe.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/xenaveradasixupid.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/52811268288.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/31797764060.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c31b79738eb---jelurewupopizaja.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/fonarifitigiremorezol.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/7b10d3c8f0a3ecab31095f639e8c1f08/23690383408.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/47524542145.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/deputal.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/39566654802.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16200937975788.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/aea4e38cde1f3274ffc86b4668c4ca48/17065622702.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/nuvatenamewikuto.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/61189860720.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/navojewadidoko.pdfIn PDF document text
    • https://www.aeap.com.br/ckfinder/userfiles/files/26952358308.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/kumovasimikerufuna.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/61141359809.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/rujulopuzewolubivu.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/larimupare.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/40663526960.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/23118660369.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/xofapapitirewumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=job+interview+salary+expectationsPDF 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_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 17020 bytes
SHA-256: e464b69808d6924ea93ffc843fb5f2026f301cc76600bd6773098286b4072b54
font_01_sfnt_off00010469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10469 10864 bytes
SHA-256: 7ee8868f745cf11cfbd550e7ba12e3771865be4ace5e3fdce8c43bd81160ef72
font_02_sfnt_off00011d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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