Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8eed75e67804dec…

MALICIOUS

PDF

78.9 KB Created: 2021-09-07 21:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 55fe020406b7221ba644ab5fb41495e4 SHA-1: b90de38e10a0bfaeb04f6973b665fcaef1a5b3bd SHA-256: c8eed75e67804deccbccdfe62e08b81fc6b3d203e1da2e77538c39160894a8df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics and an ML classifier as malicious. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/lddsoavavo61cspbfs5e66nn1k/mofuxevalefotemujupomiwo.pdf In PDF document text
    • https://brakos.it/file/17780892166.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16072cc63bd5d8---fuxenimilolomosisux.pdfIn PDF document text
    • https://digireg.dk/upload/54051368812.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/dezutivutopugore.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/j7gb2icafupffiainv2n8c0tjk/29355078804.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210510073300.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/weketexomigisaworina.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/408b8d84001bb7e33576d3694b63e2b3/sapotazonafoneketawon.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ea50f8e35f4a87cbac331d754c0d7e6c/badixamisa.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/38965655152.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a676b5aab98---zufazoropafaru.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/jegazupowegekil.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/9mlu3krvbr516rts3efu1skh2f/73272417443.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4db5db0fe---29175688175.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/fevikojuxi.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1314289b8c---bifufa.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a84c45832d2---vutoxelofirepe.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/4f2f96f33681d9e2f5abad0c8608985a/28909765303.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/571180390.pdfIn PDF document text
    • http://haverfordhigh77.com/clients/e/e7/e7c5a96ea35a64a1345a575153f12e7e/File/38481268464.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4a433a29a4a19e1800c22f615aefbd91/68835171489.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/72302418243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=skoda+octavia+cennik+2015+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E6 19568 bytes
SHA-256: a8fb81bcaab894e2768736e0b419784db56bc5357abf047ff95b1900231ac978
font_01_sfnt_off0000fc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001145c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 10960 bytes
SHA-256: f860bae7c6b74f54a1efb7ee17098c87a5a6db48e8ebc3d1d23dd13debc89200

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