Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83fd41db6d2c29e…

MALICIOUS

PDF

93.6 KB Created: 2021-06-25 23:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c1933fd9d11bcc99e2927076d95a2d1 SHA-1: d894ec3c5b5a31882ba51e3a5b829f166cb3992d SHA-256: e83fd41db6d2c29ea0ee4df2ec82552e023812891812234237578fae6226aa01
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 with numerous URLs, several of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://espacioschillout.es/images/admin/file/robawaxasoxobawunubapo.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/nh5gh2k4jl2bgd1vdd9hh2s8o8/rezavutaxaboziponunidepox.pdf
    • https://istanajpdua.com/contents//files/76642453511.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c588cb452fe---35464004078.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c0eef4872be96c9a1d6f71beb8f0fcc1/kunofuri.pdf
    • https://bookatowncar.com/userfiles/file/65019283463.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ca98d9fee---76363066443.pdf
    • https://avgdesign.com/userfiles/file/39406162344.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886df7cc31f---51968142409.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/hsu771l7bkfk22pi4frrfk524a/lejobesukidatet.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16092bf352ea64---35524905399.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b748e453893---23827928190.pdf
    • http://devison-matras.com/upload/file/pibosanikijufuwoxoxi.pdf
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/25753434323.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/3ee3e7b2291f56363d26bc3d0f14d832/migabisigewevowa.pdf
    • http://omatsuri.kr/data/userfiles/files/xiloliv.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c2b55a451---boxadegesafutosexekevir.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6adf3c6cc2d738ecc276ee2e55c55b19/33948697745.pdf
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/viletabepuruxexepi.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb2539526---47196849739.pdf
    • http://casaatlantida.com/userfiles/file///20940911101.pdf
    • http://ahkkpcm.org/userfiles/raxugarigopenazu.pdf
    • http://www.contectrade.hu/fckfiles/file/wovemefamob.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160717457807a1---zugololuzilitaxidosano.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5f8bd34a2---23570587309.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=shaun+t+insanity+workout+torrent
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 16792 bytes
font_01_sfnt_off00010689.bin
3ad89869f68890aa3dfe97671294d4d3ae49836790104d9bdb4299fc0ab7d818		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10689 20560 bytes
font_02_sfnt_off0001396c.bin
038a3c3e7cf3dc25ed2dac763ba044e6511e8ade75ea9e46e461a74a8ad97993		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1396C 16660 bytes
font_03_sfnt_off0001501b.bin
3787999b016360502491366d286029b24048b2b9450c142789ed8d85ec147f69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1501B 10628 bytes

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