Malicious PDF — malware analysis report

Static analysis result for SHA-256 70448dc8178497fa…

MALICIOUS

PDF

89.0 KB Created: 2021-07-01 09:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 899a6dfb7ce58bc7dd32838e3d79e0e9 SHA-1: 11004f88cc30257a01f8e5ae46895c6809f45727 SHA-256: 70448dc8178497fafa14e87ba5dec2da04e8d5798827a405fb3580dcc67acd12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs, many of which point to compromised websites hosting further PDF files, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the structure and URL patterns are indicative of a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/k93lcvibr4ab96fatclln75mqr/sivamubeg.pdf In PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/11625838152.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/eo6qqg939irud6i2u2lubngs0o/36747481743.pdfIn PDF document text
    • https://cmoretv.com/userfiles/15180687303.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/sobowasibuwejijugala.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/sjsk4ljhbrmkfqkgajs4750bs0/2778725386.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/bd8fr6eevjo5mgi8qf056gohch/ditakefa.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/jalilivabuviwowavukox.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa082994f8---kererobokilemepobebegiva.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/22578730353.pdfIn PDF document text
    • https://soechi.com/userfiles/file/govurivujuwifezuwosekozun.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/zagax.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/tuvanur.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16097faf25a514---xuleziz.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d237cf361---60644067838.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/89251426383.pdfIn PDF document text
    • https://sealskinz.ru/files/file/62845248087.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/bikefapotituzoxozoloxasi.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/c54760e255fdb4d2222efe21ce8100d5/tojal.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97d8b70ba2---pisunolevobak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=biggest+planet+in+the+worldPDF 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_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 10808 bytes
SHA-256: a6783c3e02287a4042dd8da5ab3a28541da5ba8d027b551c88cd0c27225742d8
font_01_sfnt_off00011097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11097 17784 bytes
SHA-256: 5c207807bd91768e14cc81a66ff0c1547b8906c81ed09df924c52d9ca2df8b60
font_02_sfnt_off00013f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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