Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ac57c6f501a041…

MALICIOUS

PDF

88.0 KB Created: 2021-09-01 00:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4808207376c8acfe2bd7667a98dc2c26 SHA-1: 004e5e96e08fca27c5d70ec5c5cde2ca8d8fea3b SHA-256: f5ac57c6f501a041be7161382cb9fa83ca033e426931dede34cf9c98e98b5c44
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting sites, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to exploit vulnerabilities or redirect to external threats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://kartinatv.org/uploads/files/31950448118.pdf In PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57bbb3db2a---jovedofuxopugokopuziniwo.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/kikuzenomulin.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1612c869231530---51805752606.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c6bc40c52---vuvevomusomoredamifavipo.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/34174659938.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8bd8cae0383482bd245247edc67dd125/8828947486.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb40b4c93a0---43261591862.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/19143691059.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/zuxokopupinusob.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/kizimuseliraligafon.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/64562687454.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/1529153539.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/93e00401cbb8f64d33e724d2cf7345c6/dasupituw.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/6369fc6a0a125344d08dda2ba7a11d92/degenepob.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/14330661914.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/19263765210.pdfIn PDF document text
    • http://rokakisreunion.com/clients/a/a8/a85ca1e4cfc2bb88d767af442173b437/File/5982814596.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16094c6c03f188---tivos.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/jelapasirureravugipiri.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/degafuninufo.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d61c5005b49---39159514785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=day+trip+kennebunkportPDF link annotation
    • 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_off0000f31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31A 17408 bytes
SHA-256: 071e7fdddf5733f68fdac9100e5c3ec262ca31521d454c5efb6f8df4c4ce2586
font_01_sfnt_off00012025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12025 10476 bytes
SHA-256: 8f05a5a75002a4a4c78d3e7fe66137f9b7a9512e9727d6c74c3281b1abc34463
font_02_sfnt_off000137de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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