Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae291ce61b758e2…

MALICIOUS

PDF

91.2 KB Created: 2021-08-14 22:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a86dbf7f3711434aedf3c7914b53c837 SHA-1: 269b94270c327b81f76b2b2aadb0b8c6b8a40de4 SHA-256: dae291ce61b758e25f8cca7cd4a2da27da51f6d980c28ed2b4c0b492a6f46d46
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is intended. The file's structure and URL patterns are consistent with a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://ketchas.ru/uplcv?utm_term=download+wifi+driver+for+windows+7+dell+inspiron+15+5000+series PDF link annotation
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f08a89407a4---papizorudivinabakukigone.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/0fba819e84eca687918ca3f4db03da95/fovuru.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/kugubanix.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/ravadatebemiz.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/19575177398.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c6004af974a28fbd26a644a1b377f7a1/38944526887.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbd0db9543---53443442877.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0585508a6f922404f82c3ff703f0c0fd/83023325131.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/sobudefutadapele.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/tibolujilefatabowam.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cdcbc444f---jakexefawiribez.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a187b9167f---sefobogumiw.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106100847373230.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/jkhq509rkpm29t9h1c0rtos5pp/76137961983.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/30279317340.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/24620212202.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/63464676479.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/88656517126.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/33839451006.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/am8tq8cpofrlvl880uq51smagb/70849989857.pdfIn PDF document text
    • https://ms01bet.net/contents//files/5713949855.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/zukozelakut.pdfIn PDF document text
    • https://viratrip.com/basefile/travelasreviracom/files/82287391426.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8974475f3---47113309826.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_off0000fe0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0D 10904 bytes
SHA-256: d9b135916732210b734d9812ef4644a67b8cf68a3d5c8fec5dee36cd1bd0b57d
font_01_sfnt_off00011781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11781 17300 bytes
SHA-256: 2c7ef428c20129db00b83e2d44f38d6ade6229f3c94c388c4b3e52179eb8d625
font_02_sfnt_off000144f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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