Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c10625a4f03bdf…

MALICIOUS

PDF

84.0 KB Created: 2021-09-15 23:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b302d768e11e69fe34db92983afef8d1 SHA-1: cbe08beb32482b3f19d66aa7acb64aa48326cc0d SHA-256: b0c10625a4f03bdf424fec65f03accbe21b5e96f1bec39b54713b3bfa4cb2415
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://krisoc.ru/uplcv?utm_term=super+mario+bros+nes+emulator+download PDF link annotation
    • https://congchunghadong.com/uploads/files/55924551235.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/zunaxixanu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16132671992589---zejotofoziwu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b4215288a1e76479d3ef322c6390d9d5/difegopukukesamesaxorewip.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/zoneronaguv.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/48167531311.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/jizonataredika.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/62235063609.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/datuwinonuwak.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161344165279e3---tixaritebaxugipevuxiwok.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcdbd956e4---gedusepodere.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0bbabecb5---donamamexabavokoroju.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/22081115282.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/gejow.pdfIn PDF document text
    • http://farashimirooz.com/files/89999854217.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bajufifedilelilepe.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/90965651041.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/tirutogubewidune.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/juxudaletov.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/43787221208.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/logugibuzexukuzikalofere.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/44794016650.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/jerepevedasuripimo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD508 16500 bytes
SHA-256: 99ee2b6ce819cad60776643cbe422dd5537e8f05b49e98068981b53f06b2f1d4
font_02_sfnt_off0000ec25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC25 10956 bytes
SHA-256: 6159deff7d187584344491bfc150db27c6bd16536eedd99d51a219fc3bc87f8d
font_03_sfnt_off00010551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10551 23816 bytes
SHA-256: e931e74a524761357e08b7d2083c583143e4b6f46628044d3dcce64c9200fc91

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