Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a277a3e5c5c4b0d…

MALICIOUS

PDF

89.6 KB Created: 2021-07-04 05:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c605302e51abb786b9cde7ca048f8f1 SHA-1: c5892dae08338369a05d11bb8e842885c4fb348c SHA-256: 7a277a3e5c5c4b0d6ec1e0552018e882ce5feebc5214f88230b4affe11a76356
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories. These links likely serve to redirect users to malicious sites for phishing or further malware delivery. No scripts were extracted, but the presence of multiple external URIs and compromised host links strongly suggests a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=how+to+improve+blood+oxygen+saturation PDF link annotation
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/21fdfa2940f78353c70bc485630be1f0/8308169596.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608058b70437a---96553449349.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/gevuperukef.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/95102476919.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8af55cdc5b---41193805708.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee71b0f87a---96792291106.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/de75184963778e6aa39d1f5049b32743/baxowixisisukawujuwevexo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c323fe2a2c1---32489533554.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a17d02272c9---14366213478.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/13c889f5868ddb651b6f3d673c86255e/55599273846.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a222d403f624bdce43e8a1e498cf9a03/54606080624.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/efeg6tvnj9s68rf8f5mnamslo2/82574818177.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f48e74ef95---7629765260.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c72693587d1944d0c9061a34944c3da1/pojumarimimumituk.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/zagojakanaf.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160949ee9c0712---fawazimudifu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/8233851109.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a54f75bf9fa---84574285385.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/25597465128.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/delesu.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/de4341bc206d915871514d6b4e851cc3/26805264641.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8730e9c7f1---fodalegetom.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fa7b6e34a---96776653399.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/85569021893.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_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 17520 bytes
SHA-256: 9dad4a87c9e3fdba2c04f2de61d6d00ceedf34171b21efd9630c7adce666aa5f
font_01_sfnt_off00012660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12660 11336 bytes
SHA-256: e174a3b0d687990bcb224006dc63738620ee4ae31f1887c2cfb4ae4df802a346
font_02_sfnt_off000140a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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