Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f8bec70795f75d…

MALICIOUS

PDF

68.5 KB Created: 2021-10-01 18:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 35c141f9fed64a767db24b2c82fbed5e SHA-1: 081aa7669e30aa9c458998005d1ae5a422fabbb0 SHA-256: 15f8bec70795f75dbea2957510b01f52d3c33a6c5430f3eec133a6af0b79f321
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to manipulate search engine rankings or distribute malicious payloads. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://giaexploring.it/userfiles/files/tixivujuwozofopukivawuwo.pdf In PDF document text
    • https://kindeeyudee.com/ck_files/files/tobifesumoniroxali.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/10921399712.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/85678498297.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/99828471665.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/wogaraninugajinijowu.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/94398557960.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/diwebil.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/31185775200.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/fasibewu.pdfIn PDF document text
    • http://szhlfz.net/upload/vaked.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161556574e2d9e---luwumesaduzuzopun.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16144c7fb229d1---redozijixi.pdfIn PDF document text
    • https://chv.vn/userfiles/file/vanegamujakanoga.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/97322567578.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/fapiwukinuluka.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132af6281e9f---71343177425.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/xasalunu.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/72736809582.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/60636916272.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155e0e0c4ead---matemuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sachin+saga+cricket+hack+mod+apk+downloadPDF 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://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_off0000acac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACAC 15656 bytes
SHA-256: 4ef8027a825896259e44edd98d95bb4f692399d3c03ca8a244e9a77b21c74cda
font_01_sfnt_off0000d460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD460 11216 bytes
SHA-256: 07e99bc77eab9264a6f81a36357c1a6bb2673c507ad9398df6aca61444e0f2b6
font_02_sfnt_off0000ee4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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