Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9141afb0bb969c…

MALICIOUS

PDF

88.4 KB Created: 2021-08-12 15:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64df28546b3fb852ca145e8676ca9ccb SHA-1: f702bf3988100f8fb98faf8f278cabcc1a27b4f9 SHA-256: ac9141afb0bb969c6456d7fa2818783d12e6433ba7ff695ec651ddc5d7fad21f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous links pointing to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users to phishing pages. The presence of a 'Password-protected archive handoff' heuristic indicates a common tactic to bypass gateway security by encrypting the actual payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082df7da76a9---jedemisuzaxagudev.pdf In PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610fc475c38cf---51192446434.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cfda66f67---xejokonusixoduma.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/p8r3a7c7qlq0c9so1qhf6b9br3/kufolozitifaketobodi.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/pamisanelizek.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/305eddc615eba6681998bf9e7b5b0a5f/34888983448.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/xijividu.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/80043545249.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e850805cdb---buwuwetikifukazowi.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/75422690232.pdfIn PDF document text
    • http://endemic-capital.ru/uploads/files/gisiluwibepoxiwemo.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/duwaxupalotenuxe.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/10681480015.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/sejonulimatiguduwade.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ogh93tiasjvh4ha1kapa3bolld/kifekafusepabinokekafu.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/j1kiakclnoidn5gv76oaoicc41/57086310728.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/rukifafasizefowijosazi.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ae5f61d995062589eca480b044aacabd/43513305867.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4fsd0dh72bg38o0nu5j5v9auq6/16157726985.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/zisadawoxaduresumane.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f079940fbd---pabid.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/35171297810.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210724073723.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/2b4h774ieeda4lfnm7g1052sr7/lovufiwofesiko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+driverpack+solution+offline+installer+setup+%E2%80%93+15.7+gbPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/83b31b04c1c24d4875a5cba63e7f66ec/42581512391.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_off0000ef1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 11612 bytes
SHA-256: 0d93b3a889ad9116b1f7d10f8dadc4181e53efb5d10618d896f0a2386e478241
font_02_sfnt_off000122bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BB 17152 bytes
SHA-256: 151337b6a857c02a05c70a6fce60e2664cfa49e3f55b4867310075da5b62c256

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