Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f90d2c1828fab1…

MALICIOUS

PDF

83.0 KB Created: 2021-06-28 20:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 970e979b9e5ff4c894b11d125a19db9a SHA-1: 01fa9cb2baf1164b212682a0acbd5d9a547e2bd1 SHA-256: d1f90d2c1828fab11b9a2e9a0b542179e165fbf2dde57bd77b7a98d502ad100d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or malware distribution intent. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=blow+dry+double+bay
    • http://marcobernini.it/userfiles/files/82372450994.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/kiviwabodugeb.pdf
    • http://nhhs78.org/clients/63854/File/59918971820.pdf
    • https://ludifrance.fr/userfiles/file/wotitorawuzemowib.pdf
    • http://italianopizzeria-pg.com/uploads/files/zopumefujosasex.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d27541ee98ff4556c7491ffad21b2b26/noximoropaxi.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/ece641df7e38938759c520ae6d87b407/18431681735.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/d61d7c9ea8688aba0a5697e43ee06e79/gologesaxonotorasi.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/ed3ec6a8e3cf7c49c90e36fcd763dcde/vagepebegaragavofijeto.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609db9df4dbcd---48702796189.pdf
    • http://sahamit.net/userfiles/file/93098925714.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/2a629790ad370e9b8105c0b62eda83ec/lowiropudibob.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90f54d09da---33485025399.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3e2e6dfe6---nezadefofosorafimorilom.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7557f503fb---dalirufinebunaxujariwuvan.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/acsnddh1g1kdrff4drj1m3bled/3039507631.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6bb573c56cb71c5c9584a5aa2950383/zunegofarelopojex.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/93199590093.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/4eccd1d198590aedb4444c85761f09b9/72113161312.pdf
    • http://crosswaysrecruitment.com/userfiles/file/45489330527.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2e49bf8a5---22100265067.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/lfp5q413116d0oqnv3paapgj12/wumalilutazaxowuvomewufep.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a74d306de52---70200598346.pdf
    • http://3dprofi.net/images/uploads/file/denidinima.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/1f8fa3f05e64021962f724af1a87a149/xikuwesaderiwu.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/242dab8bcdc5c4e6a76fbe369f6a2ed4/54840302130.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e098.bin
af70bc80380f0bc7ab5132b88032b3e5c67755f62c47bdb84ade766da142d156
pdf-font-stream PDF embedded font (sfnt) at offset 0xE098 10272 bytes
font_01_sfnt_off0000f7e6.bin
79bc3146605c68b3bc5a69f7c863d25cbb8229bea61807647ffa585a7208c8ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E6 17788 bytes
font_02_sfnt_off000126de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126DE 16792 bytes