Malicious PDF — malware analysis report

Static analysis result for SHA-256 a278ad6c000bb43c…

MALICIOUS

PDF

95.3 KB Created: 2021-09-08 03:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f8f393c1d91449ec2629ca3b7b1f8bfe SHA-1: b86b5a466dafaaa114990aa15a437ba41c51b613 SHA-256: a278ad6c000bb43c9085ab1762c100268408b561962f906906a965acf115193f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous external URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO abuse. No scripts were extracted, but the extensive use of external links suggests a redirection mechanism to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://smidgel.ru/uplcv?utm_term=2017+volkswagen+passat+r+line+manual PDF link annotation
    • https://nutricount.cz/UserFiles/File/safaxajudokuvaparoxime.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/49930432228.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/fadd5d4e2b8dfa6817f5148a948cc67c/pubotanija.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/21e94ec427a52b115216a78dc1bfa881/nepirajile.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/rejudodagodudanipijiduj.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/nozefizeverajenapatunow.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/radenural.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/qico5k6sum8k6t0tus31erg54t/tofojimekirujelazodemup.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/b00f67b5a43a4f078c6f6fc2b243deec/devesupoliramusixozoj.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b0dc69b27---suxewoz.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/80322fd4e6ade4346951893cdedca66b/xokev.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/62314840798.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e0f6cc39f---87094153083.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/8214e2aaa95ebd6e064c506c62de4510/71624397993.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/fekewilefox.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/65328832219.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22332047139.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/wovudexaruk.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/seganopu.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/2185920626eaabd372b53e3e65ee904b/vinogojuvaxibu.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e74a1d624820b39fdf337a887e2d165e/manijutazenobafewekuva.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/kigozewanotununex.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/e60999011cb81954e59b3f792f9664ce/jamuxubonekexero.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/limatejonujanus.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_off00010e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0C 11188 bytes
SHA-256: 5918879855d7e5b795418b95bc51ded69b96cca2a6c8a7af82d27399fb2d72d6
font_01_sfnt_off0001286b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286B 18008 bytes
SHA-256: 6ccd396a28bb1f444cd8984c4ca993800e8762183e88c51115f25bf47eec999d
font_02_sfnt_off0001576e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1576E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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