Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c471ad262cca8c…

MALICIOUS

PDF

71.6 KB Created: 2021-09-07 21:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ac91a05a0e244470554bd6b0e7cdd94 SHA-1: 58495e45d4da3039197d1754ca2f4c60614d00b2 SHA-256: d5c471ad262cca8c56b23630653a080135f263ce705f6c7469556859dec6dca9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to various websites, many of which appear to be compromised CMS upload directories, suggesting a phishing or malware distribution lure. The file's structure and embedded links are consistent with a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crewmak.ru/uplcv?utm_term=anti+idiotype+vaccine+pdf PDF link annotation
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3gcodicp3osb61s9refbfkpnj6/43496555198.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/33209064606.pdfPDF link annotation
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4547b34abe---20793086145.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/7bce319284e3621560ad6993146d597a/10847851901.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608443bec31f5---76460430785.pdfIn PDF document text
    • http://ahchala.com/img/file/xubase.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/pitowurubutib.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/gasesekajo.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/vedofanigenujuzovonifiko.pdfIn PDF document text
    • http://sequoia60.com/clients/875776/File/remogofenututubomufidetu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e30fb9ed619---73579928196.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/38371508101.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/50397883943.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xewevuroda.pdfIn PDF document text
    • https://cartolmania.it/file/64200943041.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/wegivomigir.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/50967888112.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/2951769858.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/92980534678.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/70201237165.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/256b8595da6fffafad1cb6f2ccee32ed/51473384723.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/turupumejebo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/11600669e98a6b0e2673fe3a264d782e/pojivizi.pdfIn PDF document text
    • 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_off0000b80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80B 16008 bytes
SHA-256: f6226c901417bd10a89795778175608fd0bde490de735c12a3852a512e24bf90
font_01_sfnt_off0000e0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 10460 bytes
SHA-256: 373fa8cf87176778c7b35b14e991952219b605c88f3e40cbd947c2d124c5a45f

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