Malicious PDF — malware analysis report

Static analysis result for SHA-256 3048554f3f33ef1a…

MALICIOUS

PDF

78.5 KB Created: 2021-08-24 13:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 570dc8cf5460bbbf4aa33647a115d029 SHA-1: 3750fa06f483623325bce9cfedff7da0cfaf61ea SHA-256: 3048554f3f33ef1a0fc49e315436257641b2289ead64c83d4c863e98132773be
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs suggests it's designed to redirect users to potentially harmful content. The document body is unreadable, but the heuristic firings clearly indicate a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b844a912---josekogufutoma.pdf In PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/68522970463.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/77158946773.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/tikeloroselorupuruwugi.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/nogonipa.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eed6f55500---50811159603.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/paxosavona.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/95438216885.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ufurfjna0ejd7q91f28facq1e8/31900949880.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/neraxemotogitarufazekoxe.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/fae3e5c9ac2cb32c670f2ad6864cf08f/dibizitaxukajajenupa.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/50492290522.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/botajatawanema.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efcd183129---widemalisufokedozisif.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa7100dc5d---guvovokonolodemol.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/36468945829.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/7453104522.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/regijomuzakoniximikixu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8f4f34b1b---54717392085.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/minagowisofapujidaxasedeg.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160773fa0e142d---labalarejuxidur.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210625/file/zifegup.pdfIn PDF document text
    • http://www.asslar.de/downloads/56724963996.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/tuun6c7klhii4brjs6mhfoue9v/xezewasinegovezotisevox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=electric+motor+drives+modeling+analysis+and+controlPDF 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_off0000ce41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE41 16852 bytes
SHA-256: 4282deaf3ad71e06379fff205799d38d1932c5f04f907fa466025c90404e696c
font_01_sfnt_off0000f9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 10876 bytes
SHA-256: c2b87c1a865e74c681ce341a29ee2b0ad090086daf20cb1e2f1ec643c0a5a33a
font_02_sfnt_off000112e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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