Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e79622737566e46…

MALICIOUS

PDF

72.7 KB Created: 2021-09-20 13:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2c3210b6a715b3e158f9122799252f44 SHA-1: 43c7d2615580879f9c787953e707cf19d774359d SHA-256: 4e79622737566e467fe6ec311f4e2a322f2c86f0c35beb76073437588311e7b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several links pointing to compromised CMS upload directories, suggesting a distribution point for malicious content. The presence of numerous links, some on disposable hosting, further supports a malicious intent to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tubijukiruxovidowo.pdf In PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/20764234749.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/jasisejatop.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210903080528_027eki.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/83267382640.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a84fee0f704c4da100cf45f6f98c172b/19336468970.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/85366093606.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312b81c0b99---kubixe.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/letagebopomo.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/eemacslnf19vh80v9cl0a69r34/kusasubitirowuvi.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109070813033844.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/1087756024.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e19417ec33---74914988792.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/vorel.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/8fd8c2bc75c4f1010aec0a7f47da1573/68340308410.pdfIn PDF document text
    • https://lorus.rs/files/ximotuz.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/limojud.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210904152443_r4fawr.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/gafurefufaselanisezovimeg.pdfIn PDF document text
    • http://vinmexindia.com/uploads/senifexep.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135c07e92956---4148842881.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/63589740958.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/jemodejonitilokejinak.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/tudewogulexalij.pdfIn PDF document text
    • http://vit-physio.de/file/janaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=play+store+app+install+free+download+for+androidPDF 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_off0000b98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98B 10692 bytes
SHA-256: 032e3ff1bfcc2d446e3e574142d9e5ae7614944552f2098ce8cadd14083ac668
font_01_sfnt_off0000d24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 16800 bytes
SHA-256: cb8d0232a1024e779fa8b7d012acfc5b81c97da2dd752c553d85cc069c4c7e10

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