Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d15b755b2e3440e…

MALICIOUS

PDF

85.6 KB Created: 2021-09-12 05:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6f9a3615294ddc147dacce7c15d4308e SHA-1: 47770f3afed923e83807f5bba17e25173d34a60c SHA-256: 3d15b755b2e3440e409c34f86ed796356340d6616e11d55784be52eda05f62f5
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification strongly indicate malicious intent, likely to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • 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://crysiq.ru/uplcv?utm_term=bookworm+adventures+download+popcap PDF link annotation
    • https://prosaison.fr/userfiles/files/36351386198.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/59462924986.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/95078257274.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e9deb3b12---gajofiwisapexeget.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/tanarokosaju.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/juletebebuzokogela.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe76987697---36905358211.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/falowefimozanexamekogup.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/sukox.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/degoxoxirunokepi.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuwepokakizomevolumekem.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/11314254982.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/4385115063.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d48950d4b9---labigobudazak.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/82297099428.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/15719146963.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/fovesijutasebisivisuvulub.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109052031364908.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/sesikuniv.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/82063727229.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/61244957939.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138f8aba5ecf---40663742161.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/wuwetefewapibex.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/rilededo.pdfIn PDF document text
    • https://clubon.top/uploads/files/varogomoxajiputovafa.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/39781291631.pdfIn PDF document text
    • 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_off0000e6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BD 18448 bytes
SHA-256: 9b8054430a8e0988e1bda91958c1f7ca417472533f79a9185b2fc067336f7878
font_01_sfnt_off000116d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D1 10980 bytes
SHA-256: 09048f09791de43d1d364c989062c2b7f222679417a5d6ed806ec3d4d3c3b067
font_02_sfnt_off00013076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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