Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31021de83ab967e…

MALICIOUS

PDF

69.0 KB Created: 2021-09-08 23:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ecbfd004179eb78a90ae402a0c0930cf SHA-1: a663cf14f2df1251ce9164889113941d2dfebf33 SHA-256: f31021de83ab967e016d1d706b4fa2b277dc3b9157271638656535808236b5f1
176 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an image-only design with a click-outward action, typical of attempts to trick users into visiting attacker-controlled URLs. The numerous embedded links point to compromised CMS uploads and disposable hosting, further indicating a malicious intent to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613662dd9628d---72790557151.pdf In PDF document text
    • https://studiecarriere.it/uploads/file/tunobudepiwiga.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/genurefaku.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/98488010063.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/vulevafoxobusozadus.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/57132494901.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613099d3e968a---wisoratezopipipisurutuse.pdfIn PDF document text
    • http://ailizia.com/userfiles/sefebilaz.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/tojokimenofaje.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/78852377135.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f638c36c72---78280297694.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/zujijixaxutifule.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/balirezozivakivuvasepega.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/sinisi.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161360a666751e---83442311585.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e40ae64e4---94849279133.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/mojomarerasulexuxo.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210905172414.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/79313595379.pdfIn PDF document text
    • https://artbynela.com/uploads/file/sutijesas.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/57167531419.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/9290591510.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161339a511629c---41445777369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+tablet+tools+free+downloadPDF 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_off0000b274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB274 14472 bytes
SHA-256: e5aa3ecd02c57c4f89ac66c44cc417e88d7b29ae9acb1bc5ca3456ac3833c16d
font_01_sfnt_off0000d614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD614 10556 bytes
SHA-256: 9132989b02cfb3aabcb6b2691b1040b5725cdee40a3d91752b5765a186d4dbc5
font_02_sfnt_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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