Malicious PDF — malware analysis report

Static analysis result for SHA-256 334351394313d63d…

MALICIOUS

PDF

103.8 KB Created: 2021-07-06 10:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 847202e9e6f5573661607567c071333a SHA-1: f317f4b96ea9e97daef3d01f4662833e6184c0eb SHA-256: 334351394313d63d465c87a424cc47fc0b0d22f27269b41221358b774c8f7878
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised websites, likely intended to trick users into downloading a password-protected archive. This tactic is commonly used to bypass security gateways by encrypting the actual payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://toanthinh.vn/webroot/img/files/zujedebezeseburixidu.pdf In PDF document text
    • http://51www.org/uploadfile/file/9683d700b7bb83bb2929b817c08e681b.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/jd0f5c4ffcpgrhp3n01l7qoq2l/37138690426.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae571657db9---96104774520.pdfIn PDF document text
    • https://wsbtitan.com/images/file/josut.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b65f2c967---puwapokopibavubew.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/q55e5j010343gkigfobbrqh3q5/11493975795.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/64ad7e05d02e03e9dc87478fa6f1aacd/45767106555.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d284f577681---luligavupotekajapotegivoz.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/0b42cd927506819f5099fc0288d74637/26141044656.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609848a3ce4ba---sonosuxokaler.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ea6bce55b---gajiburovimokoker.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3ba4e4b5b---jorik.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/wijemi.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a019e64625f---nubeluzejezafunajonoja.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/dopulizit.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/difipa.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/48071639493.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a060854f39---rujifovu.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/d5h3ur3cmkaua5u8ai0v65hev7/53330978283.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/79969790869.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ov228ijcm3f6lphekt6pf39ni0/momitodirajanazinex.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/fb2026c700159ac5bfad9a3844be7481/32366962585.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=wifi+hacking+android+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014679.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14679 27192 bytes
SHA-256: 32bf310693b45341e0349d62074e68e38f8838e1e9c04f2a4a30a8080d05d145
font_00_sfnt_off000102b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 16820 bytes
SHA-256: e40d774dcb1ef9efcebc2210ab3e919ec636d39e095b1a7d39863efc090493c8
font_01_sfnt_off00012ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC5 10540 bytes
SHA-256: 59d3aa7756bb249661f64e832dea377662362a8ff0be49d26b8248fc5950b34e
font_03_sfnt_off00017792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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