Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb048534cecbc949…

MALICIOUS

PDF

107.3 KB Created: 2021-08-12 06:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 761a4a3c6c98afb92bd2673d623bf377 SHA-1: 08f9870b315df30c4c1a1b0bba755fa298fa7376 SHA-256: cb048534cecbc9490581c93aa4e6d5b43bd7eeb0dedd0be76ebb77785c1ece74
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/83e593e6b1081a5746f0167c9740b17e/24429891998.pdf In PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69441569940.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/kazet.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/74781879261071babd561e.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/11976122042.pdfIn PDF document text
    • http://dzbnf.com/upload/file///bejoxemu.pdfIn PDF document text
    • https://people11people.gr/uploads/File/85929649960.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/nevatopawazupojamelafe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51d47c1373---63165601369.pdfIn PDF document text
    • http://master-br.ru/img/file/lujosi.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b21f6df27a3---fudidetoxubajujo.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/3dqnfrphvqnqnc2m163qnhpfc7/lanitazar.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/xupofagu.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/sanifaxev.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cee89dd72e---73139738674.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/kalunebatajumekojuzomov.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/41314166318.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/letalixudoxesimeriwod.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/tozeziwadiwuzumide.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/26678836772.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/jibiguzuzemugiloxagabal.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088b11f6f303---xetidodijeguzaj.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/239ba710c8bc7001d69f570a38af4a93/xalebawubetixowogumumiju.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/pemuzogenogomavid.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/pafogagusawolol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=novel+online+fifty+shades+darker+bahasa+indonesiaPDF 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_off00013e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3F 17832 bytes
SHA-256: 0d4515ee4aefb97eafc97f7f7e8c7f2add71bf69fee4df0d243976c929c25174
font_01_sfnt_off00016cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000184c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184C7 10840 bytes
SHA-256: 27d8985ece515bb83b95e2e1de6ddf7da67dcad0597a083c8956a34b66e39e0b

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