Malicious PDF — malware analysis report

Static analysis result for SHA-256 8595526c52ea9308…

MALICIOUS

PDF

80.2 KB Created: 2021-09-02 03:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fb30774d67005da2d02d8bf07eacdfba SHA-1: db9a0cafa0c823e6573f1fb791d6c471a6876ecd SHA-256: 8595526c52ea93084f4e52b7119d8b465740eab6b55081bec1b9a7acdd75f3fc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://ketchas.ru/uplcv?utm_term=what+is+the+definition+of+ethical+issues PDF link annotation
    • https://cottonweb.net/userfiles/file/71609682693.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/zobugowe.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/58ed6cb92c76763b05ead8456f0a195e/99626590915.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/47626778220.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5375dab55f8acabd8e5599de7ef23d71/lomalerugobuzowupa.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c7350a737bb17fbb8222b5c9668cb720/venakojupulufajir.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/37353755402.pdfIn PDF document text
    • http://gptools.net/userfiles/file/xofalubaxadeno.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/97992062631.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b715d48b082---40605254123.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fadd41c1---bilimiza.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/figakamupamidodevusagekim.pdfIn PDF document text
    • https://digireg.it/upload/xebodipofovujuzezalokomi.pdfIn PDF document text
    • http://adice-area.com/pictures/files/2834879200.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4h9lru9o27s230fteg33v9i3oq/47022407322.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/mibize.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d900702fa---bozosunupodadowa.pdfIn PDF document text
    • http://coatsofarms.com.au/ckfinder/userfiles/files/woxavugoxiremapak.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98765527ee---57942260887.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/13082801024.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/gipakugifewesi.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924ea7ce0bb---xoledafunalediguwizopu.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084e71cf05cc---56856471275.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_off0000d90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 16096 bytes
SHA-256: 9106d9580e84a98298da472e07d23711a2999de39bbf37347161fe2a5b240b5f
font_02_sfnt_off00011a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4E 10568 bytes
SHA-256: c511b0d13cd045ab7d49c80a8e788ec849646d981fd8b549e87d1af6417d63ed

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