Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee2bfa4f70d3436…

MALICIOUS

PDF

87.1 KB Created: 2021-07-08 01:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0ca0ea3d4464f08840c2aa0aefb2d40e SHA-1: 23a65190c92a57889afdc15833a50cfa8e63cf4f SHA-256: 3ee2bfa4f70d3436925949809b12697b3d74b574a28c1374891d449f2840cd94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the document, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://coretry.ru/uplcv?utm_term=android+call+recorder+pro+apk PDF link annotation
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ofejljm4j455tjojrboqosbl24/48510401892.pdfIn PDF document text
    • https://actor-conseil.com/files/file/xomotumomuvaneramisuduv.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990818cc003---32421813568.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071686a65869---14189606672.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160beb93238e5d---12353515379.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0842d81fccc19576fc9c4f2acb53cdf0/xulivazabokuzewep.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/c2a0c38bdcb3cfe3c535e4a03e157d5e/gowogas.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/c4782c962c157efa949464993ab0dfe1/jurixopalo.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d032c32ec5094098c6c525b081beb4fe/61205089772.pdfIn PDF document text
    • http://learningkey.org/userfiles/87609887784.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e376273c8b8---15426331308.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/9203891bb230e0b07fad0bf8cf8f40ef/80101201239.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075809f3db56---39896016004.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cb53b12e3---87000710032.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ef49caa7976a99600e67943e6fd1fa66/14386085863.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905b355dfac---11401110353.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/60677576962.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/totibatojudumemajiwa.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f52ffb69fbd0759fd34c24640a313590/loledemeweniwada.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/wezejowu.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/32483604905.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8059337ef---7059009573.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8f341861a55473f4d5a884024891db34/xewizitoruruziwuze.pdfIn PDF document text
    • http://www.polni.si/Images/files/vumifewiwatudixuwumusa.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/mifamisutita.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/36a3753c2864fcb0fc1e08b7e1681090/16559039317.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6956367d9314de65aa92ab841baeab59/44399451658.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_off0000f248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF248 17288 bytes
SHA-256: b846b284ee171cf5d2cf3d8f6b4a4d0c0516fce436f691634688720b79af7f85
font_01_sfnt_off00011f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13774 10316 bytes
SHA-256: df8f1e488dbf77a08e13e6d9c5641f54a6e7d0f5acabb4db765315eafe980723

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