Malicious PDF — malware analysis report

Static analysis result for SHA-256 7442ca58ae16d6c2…

MALICIOUS

PDF

78.2 KB Created: 2021-07-01 22:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ffe91d52a693e525cb0d6ae1e718946c SHA-1: 6f1b45a384e56b88a7e17971013c8a441a570b2d SHA-256: 7442ca58ae16d6c2532291ca94e4621f177dca459d8a0512b6121f822396bf66
164 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious files. The presence of a 'download button' lure further supports the intent to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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 https://allytemp.ru/uplcv?utm_term=hack+shindo+life+android PDF link annotation
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd96178c43---wiranenuxabegi.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/g7c8rc3ubvrtfi6a7pg5vm0eac/wuregim.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/josidorewox.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/cl5kpkbu1iq3bbdppvvhsfkqda/murupiwisa.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084e82ae5538---tasanonemutoz.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4a824cacdcfd0db0b2d69e60f42cdf88/tagemiwemaruwel.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/mubanugofatarenigoripo.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/49690966598.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/66944746836.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/fotigovatetutolosur.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b7f15e300---kaxowevazasuzenebot.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/36222868203.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/dusubebixobobovoxevaxu.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/4918bd0acebcca09650d92003522cd9f/ronetojibiposuw.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960a3b5e50d---mofibuva.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083314178610---6436724447.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/42615793837.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ff3b59d66---50474257847.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/nowekuminufutukirovexuru.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/20691060957.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/giledogavaniza.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077324a9804c---47556915779.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d11ef2d9d0---jefogijuza.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/g6q384172r71k9qscga4eoe4b5/77223853498.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106042315383914.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702d2df39af---18936945591.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d1c92578a---3029959529.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_off0000c606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC606 20232 bytes
SHA-256: 2b18e6bbedb3486b18c4bf82da802e9acec725477a04fcedcfc47e83e9cfe8cc
font_01_sfnt_off0000fb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 10560 bytes
SHA-256: bb11699064fb227565251595f6a1fcd31b2a200dfccf21e558a3e2025e34a23e
font_02_sfnt_off0001135a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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