Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9e436ec96b4707…

MALICIOUS

PDF

84.6 KB Created: 2021-09-06 17:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 04f8a489649cf3a070b68d8d93d17764 SHA-1: b20c2aa20b1135e7ac937d88a24df898fe0d2cb8 SHA-256: 5f9e436ec96b47072798b522a0efa5af9ab1b8fcc7db190a6b2d98f8c517d792
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous links, including those with UTM parameters, suggests an attempt to drive traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://studiosimonepantaleo.it/userfiles/files/33500384644.pdf In PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092dca4d17ac---mirajexazikiwurawoloj.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160801265b631d---51809302977.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/00fc9f5b47b9b7186f65f438c89aa325/28177592131.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee842be32b---wosesogizu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8783ba5bbb---32597709693.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/45147394514.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/7499136948.pdfIn PDF document text
    • http://sigep60s-ncbeta.com/clients/44785/File/miruwepobunut.pdfIn PDF document text
    • https://birudongker.com/contents//files/noxupojekaragolage.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/butejumurabajizorofuvosif.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/79726917200.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832d68255ed---25093096003.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/kizadataguwuratutakon.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/bokoxowi.pdfIn PDF document text
    • http://elskenecologie.nl/files/fanixud.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/depumobadov.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c310b368386---nonizobobunazagifewibis.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/mozujokapab.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/805695942.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/zegugelazogogepasufabujob.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/603738110.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/madaxuxibokemivelo.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/19969852816.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/posimaj.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/28260433025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fetal+pig+dissection+worksheet+keyPDF link annotation
    • 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_off0000e5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBE 17564 bytes
SHA-256: 7ba92ee12265ec03119976644c1154cad32d364df79685ae0e1ce6bb986a1c76
font_02_sfnt_off00012a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A87 11064 bytes
SHA-256: f2fc61122b78eaf9c2c9aa6c859564288312b29dad1a7efc5db0f43c005e83cc