Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d18c3af5e6c68d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 03:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d211b4840b5ad5f3a739e64cdd490ebd SHA-1: 3d7c801384fb29f1e23f48824beb35dced1cb919 SHA-256: f1d18c3af5e6c68d73fdbabe1022491139f9ce57bc0f74e10caef510de20a5ee
156 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. Numerous external URLs are embedded within the PDF, suggesting it functions as a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the attack pattern of directing users to potentially compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=transfer+all+files+to+sd+card PDF link annotation
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/s6qs6fggtmkp3j9hccms409abk/42164327140.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/jawovuboga.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/koroduwejikozes.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614155ddb1954---junegolalaganajoredused.pdfIn PDF document text
    • http://x-mobio.com/upload/files/83639543793.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/30805433157.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/41660852975.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/6kle9gc867tum9ak9q4ufl77cl/tafozazaderuvuxuri.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/wemepilamunonipixukovu.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/xozis.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/josufujobotulese.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/77840217024.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/40167507474.pdfIn PDF document text
    • https://medius.sk/userfiles/file/xuwututaxulupudejumupema.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/piguvutevuviniwafeferulam.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/74645222264.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/gga1v0h75eho6ceupj2661iv7s/98909821193.pdfIn PDF document text
    • https://krossi.ru/images/content/files/zexapavivijuju.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/lamototezolap.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140905a6e37b---zewinopefi.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/52309678573.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/38562340911.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/31515446391.pdfIn PDF document text
    • 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_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 18244 bytes
SHA-256: bfccd9a82d076530cb76961ef148e3deb47d4246ce50bafa11f1cea168503d06
font_01_sfnt_off00010b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001236e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236E 10432 bytes
SHA-256: 1bfb275e382cba3f98db0a802ae83dab49b8d2d738e0db0d480e535b8cb37b93

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