Malicious PDF — malware analysis report

Static analysis result for SHA-256 11adb215d9ecf3bf…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 13:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9d665257629ea841079dbdfb1f0a0c8 SHA-1: f587d0dab2b572b1470516129fd586e92dee4104 SHA-256: 11adb215d9ecf3bfa1edb7d633d41551ce5f6cdef11449f88fb4054fb6d0e4df
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://prinsart.ro/uploads/files/7848124981.pdf In PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/xakenekiwufemexegusixek.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9721110a---lavoti.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132aa0af2b74---jupirolipozexuz.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/98265551423.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/34501120535.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137942dd3b92---terexibefugokuwexi.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/ruvexu.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/54888521558.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/xiveje.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/85886307916.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/87294051613.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/53840535390.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/32095892664.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/33259439880.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/zijuxetupezawosizi.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/josasubujaxititokawasugaw.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/lnuoc9rsko33ap3utaldgjv5ea/modexemorirulebamimoz.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/27122914725.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/wefewofatetipiremifa.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/51555730310.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/70904728462.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131831f12ba5---nikomekimekevurivigotojir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=maleficent+eng+sub+full+moviePDF 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_off0000e10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF921 10880 bytes
SHA-256: 5951a45e462890c22fcf6690c4f6d2f73a226a5f331b91d6319dc8e2b7d663cf
font_02_sfnt_off00011256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11256 16092 bytes
SHA-256: 68cedf5dfd18cf2d2403d9a9b30748459a32ab3cd44e26ce5bd7cc1ee6bc114a

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