Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91326b769ec6266…

MALICIOUS

PDF

100.2 KB Created: 2021-08-03 19:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d149d0eaf4e6a53872bf77122652f66 SHA-1: 81f52be272dd3aadd95f55ae7a4ba6452783a427 SHA-256: f91326b769ec62666bca47d38bfd471aef071ba3a60d480d7f03c8c5b58bc6e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9448a6eaf3---gidalalujiwavonoteweseti.pdf In PDF document text
    • http://juliesfundforkids.com/clients/d/d6/d6f17a7a4e9d342a12f8f8eeddb80b2d/File/bimafenuribijudugunoxon.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f33eface4227783ed1b4c88f89682c22/pajoverasiwumulubodukibe.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/94134750472.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f03a70ef148---zidivu.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/mukipegabozilip.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723fa1c851c---jigotovib.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/c44bac77a1eb9617c2479f64db21ea15/vugitedurapejiru.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b958b19943c---leferumitexipurigapexuma.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/waxalurerilizuripopeju.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e45ee5ad588---lulaxinogi.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/5b3df7f4e1b1cfbf24cd559a385c0648/18628370556.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/merifezofunokorogakukubuj.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/zegudumibazurobu.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/11010006231.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/3c7d89af4d14f3b4e6d9b0991c4d1e52/tafuforaba.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/66454569444.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/wepufaxomitotirufevoruj.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/zawafar.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/xaligusaku.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/82623775131.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/570r6dqu00cegbke4nsg6rcf6l/lutepifi.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d015b7b766020bf6e3d39be13808796d/danemobubowudesakuz.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f6c77cf88---juwoterigidatomivu.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/22324148519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cahier+de+vacances+pdf+ce2PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F4 10672 bytes
SHA-256: 4992487fd6e780043dfce50650cca637e2912558dee72f6b04d8ca196c15ed2b
font_01_sfnt_off00012066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13878 20124 bytes
SHA-256: b96f9eedbb990f634e68733ae62daa2f5fc9756e13b0dacb2036e8f2e86935f2
font_03_sfnt_off00016b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B05 16100 bytes
SHA-256: 6b54a3f50d1a413a5c8c0ed289a9c866e37e8bd73df0b162fe7132700ce54c18

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