Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7e10a35b99b16d…

MALICIOUS

PDF

97.0 KB Created: 2021-07-05 15:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8c348ddc17485f414663910edfc8d64d SHA-1: 23798d90bd8f43ddb6193c9171cf33307e2c77cf SHA-256: ff7e10a35b99b16d9d7998d21091b2bc401acc0cae8f6488cf239cf419ec020c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to compromised WordPress sites and disposable hosting, disguised as a download for a game guide. The embedded URLs are designed to lead users to further malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://archism.ru/uplcv?utm_term=d%26d+5e+dungeon+master%27s+guide+pdf+free+download PDF link annotation
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/2ed50bd8cc4c220521f26305356eeb97/tupekerejobo.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/94ca03389b37a2880df8e3ebf9555955/lilezipen.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a333a7b7227---18034081565.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/fbuv5frael0ns6ehqhmnh190ga/27943268793.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/kupusujanasi.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/womeburovodalusoduboxoko.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/83106087321.pdfIn PDF document text
    • http://k1a.ru/images/files/file/63835352042.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a23d47e202a---zimifiriwanewa.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160de40136c791---26016029053.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdf67946d4---52407449807.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/066bb22b9d0c748bd9f3a774d5c0645d/vopusigo.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/pixomutijubixiteji.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/hpcnf5sj8cbq9o1dv14ga32esv/vogopumoregobuja.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070f85c02f23---82273308935.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/wakapozu.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a780d5427b---pivufijebizab.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/618ebf30cb1319dd9c17082109e25ec4/vozulatojanazare.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/qt9vgrjjca24t3uedfijnmrnt2/pijaniwolubozepu.pdfIn PDF document text
    • http://apcmagon.com/userfiles/fenesanawefokewemudubu.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86418192391.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210603034123.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a75fd0886c0---gugejerakafotatujukop.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_off00011d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_01_sfnt_off00013009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13009 18196 bytes
SHA-256: 0a9ef00f8e16734090e5ceaa9a099731f854d0f43a9f58825b9aa1026b057607
font_02_sfnt_off00015f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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