Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6cf586860f19581…

MALICIOUS

PDF

79.1 KB Created: 2021-09-07 01:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 198da937b4f3fe80b921aada141d3d40 SHA-1: 8aef1ed939cae05aabc7aa1d042f38d4be76eb38 SHA-256: d6cf586860f19581c5e7234336a880e5baf50e4569be5d84f7c626671d3e1450
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=karveli+menu+pdf PDF link annotation
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b551d57ff3---43988328788.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/tagatasosegode.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81ec2731fe---jizaxanipumofudikaratulu.pdfIn PDF document text
    • https://drsaman.com/files/xivabilozopabap.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/bexofidudiluroxo.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/m51e97hifuvd86m7o2po22neo4/33183181482.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074b1dac66a2---20267821481.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/gabexawotuzulikasomodujef.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1659a90bf---32342783489.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/23019281493.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/petaxidizowilize.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1c3a785bd34bcb1695720db94afe4f74/ruxutixemomawod.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/83b43ec1b5e29102dd9ca4f27f2cd96c/46940708401.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e33e0bc72df15d6523b4d523a173f74e/jidolore.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/sagubedekewepej.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ohjdvbtfo9mij56d70hiv57lsv/fepadipipamubaruxokukage.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/4031369380.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/8344133944.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/47773058787.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/mikiroxodolotazugusineli.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/8863198010.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/60e0e05821f92f4f32e3de14fca1c063/17375722814.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_off0000cf94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF94 18208 bytes
SHA-256: d3bb46e494439ac72e6ae569d2df28c4c5714b6262aaacb68462712d9e310537
font_01_sfnt_off0000ff26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001173d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173D 10428 bytes
SHA-256: 33bcf0fe280ea2e0fa772a9b65cce89425de611ff2b96a821155552597d701b5