Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f2417b35faa3db…

MALICIOUS

PDF

95.1 KB Created: 2021-09-05 22:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 54c44af658528cef35fb6e93364c7ef2 SHA-1: 789824889e58582278a028bfba0851c65fad018e SHA-256: 27f2417b35faa3db99974fe7e8288961079176a8bd2deaea6052e2fea38960ee
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs pointing to compromised websites, including a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a primary mechanism for executing malicious code within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nomylo.ru/uplcv?utm_term=graco+snugride+click+connect+35+car+seat+manual PDF link annotation
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f1af2bc0802b014ff0fc70b30f466e6f/giretu.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/46319741966.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/zezebijokedikadamafu.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/silulaga.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/tojagegevudemewoful.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926de41428c---xonitajegula.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/ritokokesadixotepokodub.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/67d0593d8aad4a4f3d5b8dbedb603179/volovidelakaz.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/72823293852.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/668ee164588147536041d88fd00a7acf/25291647194.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/majazunatuvuzoguwunozuda.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/83433732213.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/ce4c4be3e7cfcc3e88c4cfda64d5fce5/58258106203.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/7672e38aca059b48075fb0e0db6afda4/66013647906.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/12318f77dfc103a7cb7dd30ec070e24f/92547326087.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/0e216a37f74146f65058df635f59baba/zuzer.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/gozikaxa.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e197fd7a3f2a86f87e9d2f639c4c81af/dokukixi.pdfIn PDF document text
    • https://badrivishal.com/media/17721134298.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ea9ee5733---katixusajixobifopixepe.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210804160602346968cnrlv3.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/73543346330.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/sexura.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/91444587457.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070962039661---xidisovimexu.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/tolegogakara.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_off00010cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB1 11252 bytes
SHA-256: 084ed5af6953291d91c3d005f7bb07afa81f3790c8bdc76f391f608c9dd89bc6
font_01_sfnt_off000126ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126ED 18212 bytes
SHA-256: 09b62348111b9e0aef2aff08eec9604a2baf22022edbf4bf0980a249035aeff5
font_02_sfnt_off00015691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1