Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e71ef4ac78dd1d2…

MALICIOUS

PDF

72.1 KB Created: 2021-09-19 01:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce925332c639c3d9b9fdc0ff4de3a945 SHA-1: 4007a46822139b7373cb2723aa05b4eb056af838 SHA-256: 0e71ef4ac78dd1d28fd973e4f430d85a0717fe13d578deab7474198377f0920f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://infrive.ru/uplcv?utm_term=google+sketch+android PDF link annotation
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95f012db8accfec25d418c3c110848de/bodudiwafisiwofimufevuset.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/maxis.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/72148604533.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/22243879192.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/14879813455.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/84297250793.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/kopawuvatoxagegemudozoz.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/m992c59idcmgshsqtad8qi0817/41637501768.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/sexawimujezowovubidu.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/dogaxezolewokufalemefux.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613676603a3f7---gaxixepefa.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/9037027200.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16142571102a6a---junaj.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133373417eaa---towub.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/5051274675.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/49896374474.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/rezowofokimo.pdfIn PDF document text
    • http://coolscape.info/images/files/japegaruvavej.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210910_8E759723F8922BE0.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/46977390190.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/zorelafu.pdfIn PDF document text
    • https://russiancosta.ru/ckfinder/userfiles/files/lufaluxupidabi.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/97041167202.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/jujafamepodagepisil.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/palamovifaxabovanadamava.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_off0000b524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD36 17324 bytes
SHA-256: 634282ed80c92fa04e7c0a915790c84c99b7d5c41165e75b55cb753f7f202ec1
font_02_sfnt_off0000fa69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA69 10780 bytes
SHA-256: 782519cef8563de20c03e7da32beb679167dc73b6f0adc93c35853242d13a382

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