Malicious PDF — malware analysis report

Static analysis result for SHA-256 01891b6fba9ea942…

MALICIOUS

PDF

82.8 KB Created: 2021-08-21 05:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: a04d49faeee2a98e7c98165863be5ef2 SHA-1: 5e62876156852b4b939e8f46ac405737227af9f8 SHA-256: 01891b6fba9ea9429786482f171e5a87a257808ec8e877f1bfb1f50f5738f693
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://giridhareye.org/ckfinder/userfiles/files/roteleguxusev.pdf In PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/vvasref2csq05ki2gu2i2smg7s/47106501213.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/cda3a7fcc950775efcb6704006468e3b/pimepawikerodin.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/kepubosuzum.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202108201718216203.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a1a2d93be---26698131568.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/kabalajaxeziradumog.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc351b174a---fezodus.pdfIn PDF document text
    • http://nhs-carpediem.com/clients/46367/File/463975633.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/98700472118.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e64e0589324f715aaf42511b5fb3d51b/67886585969.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/fenudofukowoxajapefomugi.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/60b0f5d2edf6f5ff5cff358a29745d59/93547991502.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/14017221678.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/57895415294.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/cbe1307963db3c0b9f9c45cd53018503/xudepakewopomalonavat.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/97971158094.pdfIn PDF document text
    • http://partnercable.hu/files/mizogezipuvalurudomuw.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6c95feebc5a874bf5536133359901d8c/wibineweka.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/gebaxigujixuviwegawiwul.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/2025315951.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4dfce8a7d2---pazanubavatukazegoj.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ed93ada6d78---50616658442.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/89197966149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=cuantos+cm+cubicos+equivale+un+litroPDF 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_off0000dcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 10876 bytes
SHA-256: 9803af46ccfa225227bce5262ead29dc2d410cec1d1e50d065fe249e3f44200a
font_01_sfnt_off0000f61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 17564 bytes
SHA-256: ba5e45a27c69c1043c8f502358d73132b0c4c819655ce90d5ebb8e31093e32e0
font_02_sfnt_off000122e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1