Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ecbe1f35c62120…

MALICIOUS

PDF

86.9 KB Created: 2021-07-02 10:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23ee7f6b9756a7d15467cc6f82f18094 SHA-1: 5778452c39ec0408fb6b9860438267924a596ecc SHA-256: 09ecbe1f35c6212015977587fcd596a96ac9c03ea9bc25da33b008153b3cbf70
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other unknown domains, likely to facilitate a download. The presence of a 'download button' lure further supports a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737e7a3b046---83417547832.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f3ff79d93---kasozurozugajupej.pdf
    • https://xanbiente.de/userfiles/file/webesudofesesoses.pdf
    • http://lhsclassof68.com/clients/73441/File/sukapinaroxizifexiwo.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a1fc406b31eece362d9b8ac3add5de06/rararagezevafewegir.pdf
    • http://exoticland.bg/upload/files/files/buniviledaxux.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/pegoduk.pdf
    • http://samnakthodrahassob.com/userfiles/file/14496035193.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/cdca10322b046201bfa95e0beee13707/lutowofejosexulajixep.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb746773d1---zexit.pdf
    • https://slide-bearing.com/d/files/42573791135.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/5e149515faeaf2ca6a2f0f4d70242a0c/zagosel.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/9ae895a6e11d087d14efe594a26e8443/kewuvomowit.pdf
    • https://santechnikosdarbai.lt/images/files/sifet.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609e17f399502---62549528621.pdf
    • http://elma1.ru/!upload/files/gakitasadusovapuv.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab9183743b---7302513083.pdf
    • http://hutergroup.de/userfiles/file/xarixesulitorowizefaxoriz.pdf
    • http://robwalker.net/fckupload/file/navekulebosokupivarasixu.pdf
    • http://baigeleather.com/userfiles/file/delinoriferagupuma.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba7dce9540---nobebonotikemezivobawar.pdf
    • https://grupahatak.pl/admin/_fck_files/file/jajomifepawalakakiva.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/aa64d8f72e86a95a143ae15f3b2919f3/21403053253.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/jcqljub55bk5q6li5pvua17ccl/3857350328.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=coding+and+decoding+problems+in+reasoning+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_off0000ec85.bin
89a079284152b628edbeca0b36e0f6dcd7a3556edadbcee9513b5c3d748dbed3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 11036 bytes
font_01_sfnt_off000105b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105B2 16792 bytes
font_02_sfnt_off00011dc4.bin
222035980032e96a60cfce150bf08d08af5fd02c081237bea132fe7a5aa3add2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC4 18324 bytes