Malicious PDF — malware analysis report

Static analysis result for SHA-256 b834d9bc7eb02453…

MALICIOUS

PDF

72.9 KB Created: 2021-09-08 02:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75d1e5781b3a242e6d980cee029a9777 SHA-1: a475701d208ef95c57116b7bb57dab24250d7eb0 SHA-256: b834d9bc7eb024539b09ffb15c244d034cba358b0a1211057992dc5f5efeaa96
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of multiple PDF link farm heuristics suggests an attempt to obscure the true destination or distribute malicious content through a network of compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://monkeytailranchdonation.org/clients/e/e8/e82116dd0b5861b0917add2a69208af2/File/32498992537.pdf In PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/17414308088.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/21054888335.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608501cc9ed3c---93964301869.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/96087625112.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/mexegezizi.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/pexazadiditipumaniwifi.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/74884495139.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/risezo.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/7qlgtuam4m1q5gujdeka7hepgh/ladotekaxutasubujajuji.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8cc4f403b---gadelomusenanutekaxidu.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/6a55820440389419c091cf07116ce639/vuruvegipijavidibonuzipu.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/p4t8v0g1gs8b9simslinigjrru/besakolumeg.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3e538b709---89393455850.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/25485685795.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/lisezedip.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/70ef88dd4cf8157727bc0d86564e2812/supijaxujaxixiwe.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/sibixapuz.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/misoruxopi.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/46368969472.pdfIn PDF document text
    • http://abwva.com/uploads/files/85496868543.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ubhpgbeooqp1hv5q1vo68f90p5/10775769026.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/lajosubarapepopilod.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/55882488010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=tatalaksana+hipertensi+menurut+jnc+8+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5B 15348 bytes
SHA-256: 877485da025d02d2c188054c62aaca3237a08b31a5ec738b1003194f1344e236
font_01_sfnt_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 11256 bytes
SHA-256: 1b709ce8da626593f0a7a79b0616e5b2ac5d154501d1d656288d0e7b8cd18b2e
font_02_sfnt_off0000fd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1