Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4c7ca2520d40d0…

MALICIOUS

PDF

87.0 KB Created: 2021-09-19 04:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6eaa2a768292b351bba5a71ec881a6fc SHA-1: e17b77794448584febec82f26bb34f4ad50c5730 SHA-256: 8a4c7ca2520d40d0a7101f0965244381f677986455166b77b81f08f7c2c71499
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of embedded URLs and the 'SE_QR_LURE' heuristic suggest the document's purpose is to trick users into visiting external sites, possibly for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ambvetsanprospero.eu/userfiles/files/zagupudupiviso.pdf In PDF document text
    • http://www.mustwalge.ee/data/content/files/soxurefizun.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/89302092367.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kagijojumegigibawejenid.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/57052584981.pdfIn PDF document text
    • http://staropolski.net/Upload/file/95979235765.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/81211894987.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/limonoraxojumunex.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/51497334013.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/jozupufiwaje.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/61285402568.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/22276875132.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/14799406601.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bachviet/20210912/file/33611851774.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614345f52c3c9---megebiwivulonuxuvem.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614621193e31e---fuxafavafopimuxurajopan.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd5f5d131a03fa079ae5b1432175573a/pakukavagunafe.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/dizuxugovoribekofewi.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/94726095413.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lifopugarebavujuxi.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/88226566792.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/tagarudefifirifakovuviru.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/namixurezarizuki.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/tufudakejuvowimega.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/gm7ggp80v1ko96t35tsqk95tde/sajutozimuxiwubija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=norton+anthology+of+drama+free+pdfPDF 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_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 10776 bytes
SHA-256: fbb6ad9a5b3d4c1f30fcbc96ff006292ac628fe311be26c44e4bcb7ff124d19b
font_01_sfnt_off000107cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CF 18172 bytes
SHA-256: 4d95f20e2ad33f60d60e95732d2c047ad55153fcce3eb813636ce74609e50734
font_02_sfnt_off000136b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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