Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c90ed957c86a91…

MALICIOUS

PDF

85.2 KB Created: 2021-08-22 05:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: afb15ddb8594804c7f6e23ac158a51b4 SHA-1: f95d4062456a7c8eee8872a04c316db8419b0d54 SHA-256: 19c90ed957c86a916500d672c2ddcf5862487a675ec0ba5b1e96e28a3a4ce8c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the overall structure and URL findings point to a malicious document intended to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://medtravel.pro/images/hand_uploaded/files/ditabazotamakeporati.pdf In PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ae04bda00---56968065617.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///minimoxovofaregalop.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c4e4d3066---78547346132.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b716cd80f---75178280510.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/2a3koprkgg7c6t3v4i9ft8ueb0/lubifakewigavivagoluxutav.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/78518fe5e14279ea2b1ec60be6c48c16/22628400796.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/99136732815.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/sboet6dl44n9t89j3li1defm70/fadufo.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/texajixobuv.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/pgmq9d3hp8855am3vj4cagutn3/77289647294.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/tafalusagerup.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/pojatuxatu.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/paletojoreropol.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ee26086a9c5---19187881600.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/wosegewam.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/wugetegibatuwexisijex.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/53728998743.pdfIn PDF document text
    • http://seamacros.com/upload/file/serosipusosawenazozafi.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/10879924212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mobile+repairing+course+books+pdf+free+download+in+urduPDF 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_off0000e798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 17028 bytes
SHA-256: 105d79676724babb08bd228e93ff154ade8f31847ae2dd6e401c86aff49d615d
font_01_sfnt_off00011436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11436 11108 bytes
SHA-256: 1577ad582a1af1b60ad6d3d10b1e30154dfdb11dfcd8611306470109adaa1821
font_02_sfnt_off00012dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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