Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe552a8e2b683c9…

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 01:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a138524e519d0eb38c24e53ce6edc82c SHA-1: 173fde00253aea20165a745d126176b806b4a265 SHA-256: 8fe552a8e2b683c983027d2b1c503a10be2cee132e4fe52056321acbb08a8a6e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage, suggesting it's used to distribute further malicious content or phish users. The PDF structure itself is also noted for duplicate object bodies, which can sometimes be used for obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ezokniga.com/uploads/file/kawexiguwijanubowazof.pdf In PDF document text
    • https://mandarinkinesiska.com/userfiles/file/jesajimobinamujadokadema.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/dotedawizinamexewek.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/27267999470.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/45867478986.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/perefuto.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/13245589833.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/34401548949.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161384decc7162---26322897411.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/16663002611.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bf081bc53---75876958949.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/norutalojurobigomudoz.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/tegugo.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/67634638325.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141641f73777---2158126779.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/fivabuxojifariv.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/72843210604.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/40931020382.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/25574236013.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/69176155018.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wabetafilibegusemagepu.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/98699475069.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/wuzovovidofibozogeva.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/3cdd2f5785ed697e037e2c1da1a5197d/bigaramogolezifofirakufad.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/govidunuxesawakizakusegom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=garrys+mod+free+download+apkPDF 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_off0000e606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE606 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1D 10800 bytes
SHA-256: 290fcba68996c149dafdddf63f815757966a39c9f19d8a76fc347bda7f5824d2
font_02_sfnt_off0001171d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171D 18944 bytes
SHA-256: c7db8827c64509131c6eef27a99258212280457b3e8aa9d6702feaff6bd41b02

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