Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5544a49de076bba…

MALICIOUS

PDF

71.0 KB Created: 2021-09-12 14:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99f6a3a26efab0b5735f1314813e0d0f SHA-1: f928ac19fd8c96981504aa985b476807808e4730 SHA-256: c5544a49de076bbab371d9a86e0b472dc5433dec88e7d933e1f42f7611760e09
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious links, which are designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://pixomot.ru/uplcv?utm_term=3+seconds+in+the+paint+rule PDF link annotation
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eabb45aa4b---25643170864.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/zitipemezumineguposa.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd638c7bd---rosejeket.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/kevegi.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/jidikegezotajubexiz.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/53497369534.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/12518903423.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/jasuxasotenukovukumowo.pdfIn PDF document text
    • https://kultmotor.hu/images/files/vewibulogebafotezowilujup.pdfIn PDF document text
    • https://panoramabyty.cz/content/lukifafubogapapod.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b041ac3a37---woxikobi.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/zofebebiwowuxawazewederaj.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/xuxibamovebura.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/22389470597.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/86475289584.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/wufupujidosinoxelogideba.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/8f273134fc0bdafa2ee968b423e3a31f/larikiz.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/jominubogoxepodopitagomax.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/32932015918.pdfIn PDF document text
    • http://homeopathyhk.com/files/futuxegutidigebaju.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/52842c32aedce935095bf7f8ebbbe09f/xamuwepuzuga.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/bajazamoxukumimobal.pdfIn PDF document text
    • http://potya.com/54334238392.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc09ef368---97145724456.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/godubenukukepubonot.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_off0000b7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FA 14904 bytes
SHA-256: 660e40f9e54f6f91cf8a13785ab925bbf79fbff6a1f5dd760a60285827f7cfde
font_01_sfnt_off0000dd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 10784 bytes
SHA-256: 3058a5e8f1be428e7a0c049b074741c4c40234993837ea9d37c0f45ba275bad5

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