Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6d9a2235689a72…

MALICIOUS

PDF

68.7 KB Created: 2021-09-02 22:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: baad572af905d0b0dfeb1935efa69a57 SHA-1: e05c459cb5bfe1491b6ea01ff1849df1ebea6999 SHA-256: ac6d9a2235689a72e2ac6538148457630eef1e7f23439ce9ce18db7633f1302f
156 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and is flagged as a link farm pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or phishing. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://oniceh.ru/uplcv?utm_term=jhs+muffuletta+manual PDF link annotation
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/1cf38dd08b522ad7f1b0cc97cc9a4f4e/36258934605.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/83131591794.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3005925faf---84836478344.pdfIn PDF document text
    • https://magerp.org/upload/files/86188162552.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/44af2d8cd7d6de1af4680bba790f51f1/rosiv.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c76c27b0507---jufegowekafepinojefubag.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/1492631209.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/tukisigavuzugifobomifarut.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/zewilovu.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/lalituwizirixedajidiz.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/26392932076.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/6625809982.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/37209014704.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/fbcad2a01d26c99b634c84515b5cf579/gaduliro.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/23508414817.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/jozolek.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/lojupinixipulilowibib.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/33658593074.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/pukexagakusol.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/telujelego.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/82502763834.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_off0000b132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC949 10256 bytes
SHA-256: 8e52316e1712855e60b65b5ef4c147bc49b082de98f2d5ce822129d3f8325410
font_02_sfnt_off0000e02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02C 14896 bytes
SHA-256: 08605b97df624e7616eef4ff96ec345c2456ce82807027ae2eb682c411b69824