Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5afd85d624c9f3…

MALICIOUS

PDF

84.8 KB Created: 2021-08-09 09:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e956c49a7daec75ee13c4e8737790b0 SHA-1: 1e577e90b7942ee65fe867cbdb12ee96dc3ef282 SHA-256: ea5afd85d624c9f31bccf7c13d55a3791ab54f2bcb500ee5cb3ab9570ae91f60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm utilizing compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to external sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/eee6872d3048a27c8f4af4251f911a54/35353367521.pdf
    • https://m-astar.com/UserFiles/files/zafamuxanulidirejisutapek.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/wawanuzikolug.pdf
    • https://itexpertdog.com/upload/files/38731133384.pdf
    • http://bydnjl.com/userfiles/files/58286321201.pdf
    • http://drairtools.com/ckfinder/userfiles/files/83817989946.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160845fccd7f1b---kepatikal.pdf
    • http://lumieretvie.com/userfiles/file/80684955387.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/fbb7762bfa0bc9989cad70c7d0c3ec00/guwerupewek.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/31231007829.pdf
    • http://charivne.info/images/file/76584081295.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/xolet.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8b38f3ca5---kuzifep.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/10d44689250852216ad8f4afc232c732/65914128887.pdf
    • http://alptw.com/images/files/pisibojadodevutatogag.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/konurozafazefijobeloma.pdf
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/58714879139.pdf
    • http://se-ty.ru/uploads/userfiles/file/xixesineli.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e43270c539---32195563276.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16105c680a4917---fojusozudiselekazi.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e47ae62215---dobelabekikulorajupenuna.pdf
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/nuledukewejakuzo.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/vbci8034nn5eecpusg0g73a056/49802945025.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3327353198---43410657412.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/3ac984163dea5b05e89c3e44e346d5cd/81280093889.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ejercicios+autocad+isometricos+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_off0000e410.bin
02fa6e41877197bae113610f554ca21dd4591eb75dddf198d8ea9e8168754f26
pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 17776 bytes
font_01_sfnt_off000111bf.bin
687e071eb9cdc14920ed01933779d30ce751d8f0216b3ae9ab9a4fee688dc9c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x111BF 10844 bytes
font_02_sfnt_off00012ace.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACE 16792 bytes