Malicious PDF — malware analysis report

Static analysis result for SHA-256 50de19cf5a5059ce…

MALICIOUS

PDF

89.7 KB Created: 2021-08-18 07:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ab1ad7a42de04e3dd43402f60a895a20 SHA-1: b2fcddff183a5398f23615303a17767ccea308c3 SHA-256: 50de19cf5a5059ce0e9ca2e4d830f63a9092574be54f81fda81ed9f338f0f72a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised WordPress sites and disposable hosting. The embedded URLs, while some are marked benign, contribute to the overall malicious intent of directing users to potentially harmful content. No scripts were extracted, but the structure and URL patterns suggest a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://comobrew.com/newsite/images/user_uploads/file/poxivifipikot.pdf In PDF document text
    • https://nistd.in/userfiles/file/juvojudojixiwobogux.pdfIn PDF document text
    • https://adium.ru/userfiles/file/didufujobijon.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160db8c5770586---wediror.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/ferul.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/bokejizizakujiti.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b59d9ef47eb086e2c79c0c2dbff26b9a/tudekiwupanedesobuwami.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/b3e5a633c2755b41e48428d316c5346d/kejuzi.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f575c03645f---17850037379.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/eie6os1q8336kohbor44gusdnb/wetotavilopasufevexovelaf.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6be1cf1d8---14239405876.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607463d677d4b---41155614059.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/27881776561.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160706c196e253---rimukupib.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/84a31d061ac43ccee1b67044ee9ecb5b/mokugevixikose.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccf03ea959---zagemoriji.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/d54a35183b2ddfdc6d161e85a1a0becd/18463054179.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fadcc5b2d8---74138438020.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/271qtr9dt7vojpumdi0qhf2mnb/mudugafin.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/dokazivi.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/lijunimenetosusamojow.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/23295648439.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/zuwuwidebawol.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/mixufosolakonifetumonop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=apprendre+le+chinois+mandarin+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 10768 bytes
SHA-256: 238854b639cde2e98125a6e598afba86a1392494a432ab5ed7a7294eaad05da0
font_02_sfnt_off00011451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11451 5112 bytes
SHA-256: 9d3c9fa1250da89f8557ecc2e1e1019d556f71f8337424a3b0beed545f0cd227
font_03_sfnt_off000125b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B8 19548 bytes
SHA-256: 9413dcb28e2fe0e4207f5b0ea69f8006667022debb97f937f452f66dd3926cbc

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