Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6554b75e7df5cb4…

MALICIOUS

PDF

92.3 KB Created: 2021-08-09 12:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6d006643455dbd56493a8da618536101 SHA-1: 188c2ed661769417b63fb89dcd061bb03b0d38af SHA-256: d6554b75e7df5cb47d0c4454a89850e77d80d49e142354096938957a7ab2d264
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves tricking users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://archism.ru/uplcv?utm_term=get+serial+number+command+linux PDF link annotation
    • http://myshopgroup.com/userfiles/files/95002090662.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/zopibaguziwi.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ah43jpbj51p6p79l16hq4db2ie/virosovumove.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7vfrd3733tnlnlk3aotm96rem/83263613327.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/jofuzovuwabuvutebolet.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb644b3da6e---fakojoweviludezuti.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abef7cd70ed---nadirevogajok.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/zotebu.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162378380873520089011.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/15705904964.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/mm9rqhdm59lcullkvq2573e7dg/40058124164.pdfIn PDF document text
    • http://labsshop.com/d/files/kalidetuvurodavonotifuril.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/83089217037.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/31200928288.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/83513727370.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/97355218997.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a0836dbcac1ae34502965a959ab0a823/62993236740.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/ab16c73652a128adc655e06b4642993c/xixunufemimenomelagiris.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/flq6v91brdvrt16roi6lvrl7l3/zagezalunore.pdfIn PDF document text
    • http://peoplefoster.com/pliki/20277981105.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_off00010462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C74 17236 bytes
SHA-256: c7faadeb8587c4516c3be47a2bb638c54db4ab6e846d7456eee717fdf6a7e10e
font_02_sfnt_off00014994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14994 10912 bytes
SHA-256: 97129e7bfc64c04ff495b66d503d35d6a746a469e84bc9cadaece76b456e1ef0

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