Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a41f7ca8988bb8…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 16:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 481a5e74557af605431aba83b9c9b177 SHA-1: 82bb0c145b2e5fb9df17c3a7b8cac55e2e5f0db6 SHA-256: 91a41f7ca8988bb8a4f2170a6acf336f7af8f5e82be120f3e996fb107145d16a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on disposable or compromised platforms. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule strongly suggest the document's purpose is to redirect users to external sites, likely for malicious purposes such as credential harvesting or malware distribution. No scripts were extracted, but the document structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hunghiephuylog.com/upload/files/niresebizinarizasajazero.pdf In PDF document text
    • http://rencontres-icare.org/userfiles/file/jawonituwusi.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/10860131442.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/jvsgcu6jblo6s4pgjlmh64kp48/lupisunarafatu.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/zexase.pdfIn PDF document text
    • https://deepex.hu/hirek/files/xozenis.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/12650903332.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114c4f81e79d---50129196858.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/62211287199.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/dioje3jkspb410nb2c9pd85u40/ziduwipowopozefutojaximo.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ea90889f643ee2e47e26e227555fc797/nimezowe.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/sarobolixifetele.pdfIn PDF document text
    • https://austarpharma.com/upload/files/87637613254.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/vaneretosajapi.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/tukiwavejidovedemazijadi.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608019b1856ef---gixovonuluseb.pdfIn PDF document text
    • http://fotossc.pl/_files/file/bukomus.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/xanijoxuvilupunobata.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/3754183650.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecedb44faf---movosesugolutobab.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/9d682ff417f90c7e10de37db65671571/80164804269.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/85cfd3f905efb3319e55f304d0e464d0/xugajimilanikiweju.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/tevomidolujinineb.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/somafesikerelisigatis.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/jasubim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=jpg+to+pdf+converter+download+for+windows+7PDF 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_off0000e535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 17124 bytes
SHA-256: 89a99ae54b2a8507855f4b05c716dfe44b4f1b4667358add4f29a5257a1e612c
font_01_sfnt_off00011175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11175 10988 bytes
SHA-256: 2733c55b1a69186d66423c5d98be0ffb3e6cd15d9536fb1e8a999a9850b12d01
font_02_sfnt_off00012b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.