Malicious PDF — malware analysis report

Static analysis result for SHA-256 01bfcbbd1761cfe6…

MALICIOUS

PDF

92.7 KB Created: 2021-08-25 10:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2730f3b9cc6ced22bc65fadd7690f96a SHA-1: 479c47acfb42bc83c40d8cab8130abe51260d4df SHA-256: 01bfcbbd1761cfe6c55945184b9b8e65d95bb315cab9599bd08bf7067fdacfc1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/mh23v4lg44am9namdolssghu75/niponewixuwudug.pdf In PDF document text
    • https://mecaniquekd.ca/upload/file/6509775991.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/pidoxugawuxin.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608827fb3e435---jidoxasiluxelaku.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9b333bf52---68322456336.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/wuvogufedex.pdfIn PDF document text
    • http://homeopathyhk.com/files/tibonadunevomupifesadu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cdc04d04c---dogarujavil.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/posugamevubazum.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/xigasozosu.pdfIn PDF document text
    • https://energooptima.hu/upload/File/21091773083.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210611023619848.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/39710477680.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/xenisunaburesodegolewif.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/vekumonafejuwutemomisos.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/legeraginafanupat.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/12763074211.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a262eccb31d---35760870479.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/o4bv8c2hp15et6j52dmqn8cir0/tozagiselofox.pdfIn PDF document text
    • http://willbramephotography.com/99252421190.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/c30cd503aad9d252a3dfd7f2c1797b4c/31392787419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=advertising+strategy+creativity+and+media+pdfPDF 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_off00010449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 10960 bytes
SHA-256: d0f6c19f4cdaf4747d1160d8f64ca986fb07719f3f29fe9d96417f378d52f4c2
font_01_sfnt_off00011d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D89 18032 bytes
SHA-256: 14a0871deaa8550a335550e8b3151c27a728df7d3113be6287bcdd1a6e82f1dc
font_02_sfnt_off00014bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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