Malicious PDF — malware analysis report

Static analysis result for SHA-256 79da8992c5a56574…

MALICIOUS

PDF

85.4 KB Created: 2021-09-14 08:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39c57fc8a711a17a42c416a70166db9d SHA-1: 5da8ebd3a656c7e4161b6724c76a1ff58c39546a SHA-256: 79da8992c5a56574f80dfcc67c9c5e2a8c0339695d3ee1fc4938675143bce430
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics point to the document acting as a link farm and a callback phishing lure, directing users to potentially compromised websites or to initiate fraudulent phone calls. No scripts were extracted, but the presence of external URIs and the nature of the heuristics suggest an attempt to deceive the user into a malicious interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://hamasataccessories.com/userfiles/files/kudizosajoligazejatupul.pdf In PDF document text
    • http://aliceinformaticasrl.com/user/pages/63946326417.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/41041672586.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/jupufiwerajugofobozoge.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139d49c011d0---vevur.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/juberasuvixogesizagizuped.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/1accdfcd9b92b49efc0b1e72a6cb0b96/64867757824.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/voxofefuwuruwegotami.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/gagomopogujid.pdfIn PDF document text
    • http://superbarter.sk/media/file/75203029862.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/52203477810.pdfIn PDF document text
    • http://secoinblock.com/upload/files/93519823716.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109030615571011.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tudutil.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/falumedutovapetowedomi.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/65957453882.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/71449624105.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/faraliz.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/4224410986.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/41464982940.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137de0bbecbe---27505004187.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/vekowokibamoxuwuxi.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/10257596561.pdfIn PDF document text
    • https://kiptep.ru/file/83064632780.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/texisanuwikizofar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=a+quite+place+watch+online+freePDF 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_off0000e8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 18176 bytes
SHA-256: 4d57a0876337659c6b717628f2b4c715431f20b3e2ff208e8e436aff00ff7995
font_02_sfnt_off00012f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F97 10724 bytes
SHA-256: fdf51abc772b684d491d7c70ce6b4b70a7db583a158f9b9664a47d3ab739a1c7

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