Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0a3655116338aa…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 13:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dac29e2f8cabedcb2ea5df8a21642918 SHA-1: e9bc9580a24e8afe2d435585232831f416295eaf SHA-256: 7f0a3655116338aab6a7dc50df0e30d85e2f7501d11ce43f62cbce85d410d19e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple URLs, many of which are hosted on potentially compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' finding further support this, as it indicates an attempt to leverage search engine optimization for malicious links.

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 http://curry-box-deluxe.de/userfiles/file/67441100911.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607bac451f97b---lolezabilolun.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/78007247479.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/vafupazipuxopuzoguraguto.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/d1ddc0fe37a2c9a318d768362a72069f/jerebokofekup.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/28502233332.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fad17a3ac5---71177061737.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/pajiboribifagesefifigib.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/10224035533.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/86116165217.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b04b917dfe8---wijedagu.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/wevurejinodadijefoz.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606da06f20601---luxobiletijonubomunekiro.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/5888fe08656ab010859ffd3fffdace36/34451959596.pdfIn PDF document text
    • https://bataretak.com/img/files/file/78179274883.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/jitafosip.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087535f109d8---wupegu.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/42890664909.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/c012e9d550f85d2d85803eb493d12cbf/45636521409.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210804125233.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/71997652489.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608160ddc8177---sumobenobe.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/ff19fa52d4ebc4aa43f948f1db97dfb8/benowurozedujupiteridum.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b0ae84cde---58839311941.pdfIn PDF document text
    • http://195exim.com/datas/files/79563046205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=atlas+of+clinical+gross+anatomy+pdf+free+downloadPDF link annotation
    • https://lapdonline.org/file/lureb.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_off0000e367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 11144 bytes
SHA-256: dfde52527e16eee9ab52b73bf76c7697b09827a8e3deab78175a5d919649a547
font_01_sfnt_off0000fd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD56 17868 bytes
SHA-256: c6d456ff4d337ae516c43a0371aa36af99470d7b85a6b63483a63fb612442887
font_02_sfnt_off00012b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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