Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb4317e640ec2c6…

MALICIOUS

PDF

96.0 KB Created: 2021-06-30 05:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa05c9ea6d8174110dfd46914fa94e5a SHA-1: 2ed6b14b82cf15ff916c697e66cbfbca3cf29d7b SHA-256: 8cb4317e640ec2c6738f76d297d276ae7c72704b43d79bab3cb8cda28eaca01e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and link farm indicate an attempt to exploit users through deceptive links, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://huntic.ru/uplcv?utm_term=the+13th+ghost PDF link annotation
    • http://toeicspeaking.net/_UploadFile/Images/file/90810929064.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff4dbd7dcb---61306478899.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/4dee1dbf3474de7ec4384606e62fecbb/33977637538.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608357fe0ae24---gipebokoxatovezetor.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/2dd7910300d4d18676e9b1edf1d75cf5/1049270704.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/sinuwak.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/ki06ukofsab3c8qqp0slv9tt88/buponuvarit.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/300e688de68ac10a718f9c49572844c8/87434159494.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/8994ca9dd2d811fece98c2993aca4a6b/lizinibisa.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/wetexix.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b88d9b762---80469507982.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9d4e1592176b72f0d45b35af6ae4165f/91452794569.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/99544777466.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adcd866ef76---14767011733.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/rimeribiga.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c02b13140---35278768505.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/30944808646.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/1e081f1e2009436a2c72de288c6d80d6/53838421086.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091be94bcdf4---lixewosamaralediwigewevid.pdfIn PDF document text
    • https://samowar.ch/upload/file/21086268273.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/61432182004.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/67435354254.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/47vsooppd4k0slqo2bpt2qc2m7/55394900316.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_off00011392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA4 18252 bytes
SHA-256: 81bd1da9d769ed1fea369ec7260b5b2cddef4c5d450ae38101755f8b8f5f08db
font_02_sfnt_off00015b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B34 10068 bytes
SHA-256: 6591bb9061992084f93eb9fc3ec14f94b6bbe486459d7189638c03322708865e

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