Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10ca995a47ea042…

MALICIOUS

PDF

87.6 KB Created: 2021-09-15 12:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1bff4c1f040160fce2b5dbd8acbfa5e SHA-1: bb879eb0bbd4d1fc065ac0738c76c7ba616439fa SHA-256: b10ca995a47ea0424b0c880b87e21b2c8b66aadbdc02877d4086692a3f86c890
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which appear to be compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the structure and embedded URLs suggest the document is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://preciseenergygroup.com/media/85800539297.pdf In PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mowobaloxovurupabomefoxar.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/lekogobukazus.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/mivaxeritaven.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/votamox.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418bf550679---tonibipezonutegolaxaxapof.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/pabofezisopus.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161330f244903a---kukejixitavadunegi.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/loxapezuzorodefe.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/20892722291.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/82901641116.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/43323842872.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/8d270fdf423b32636aacf94b4f8c5d86/82765381721.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/gebizipunapuxag.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/60134646721.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/17214362548.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/95900920339.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/19478787177.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/jijekamatuzotuladipasirat.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bce008ac4---42297082991.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/fawajod.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210913_8EA5BCF142B4FCCE.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/lulopodapap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=set+it+off+free+movie+onlinePDF 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_off0000f17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 10184 bytes
SHA-256: 3abbf8980675c320eed8d3307785ea8de262f477d875548017d38a17f34fbc89
font_01_sfnt_off00010848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10848 18456 bytes
SHA-256: f77091df219f7bed2f6428dd206b82f7e998858b7b7b7f0cc57d3a9321113bb5
font_02_sfnt_off000138b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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