Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f32ea5986b92040…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 22:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d4fa19d9b16cccdec3f3cbe32654218e SHA-1: 3a189c326a2e6d45281dd0ab03d7d1ee203426e7 SHA-256: 6f32ea5986b920401012f4fd513f05e82d00cdeb2c4738e7b3316bd553822970
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs and is identified as a link farm hosted on disposable or compromised domains. The ML classifier strongly indicates maliciousness, and the structure suggests it's intended to redirect users to potentially harmful content or for SEO manipulation. No scripts were extracted, but the presence of numerous URLs on compromised CMS uploads points to a malicious intent to distribute or host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://catamma.ru/uplcv?utm_term=alone+together+book+pdf PDF link annotation
    • http://niktid.ru/userfiles/file/54019060894.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a624075fb67---47513735153.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/8659649802f829b39102f2d111a01722/bulibugotifixulekimemi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8fa68f67b---juwazewukijakonokug.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/81692340014.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/696e5ffaedbf906327fa3d7fcafed9fb/rezowopulebusukufusijajox.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/35ccec2dd1327d3c192e557027ef6476/kisenenomejafevofir.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bp0bu790g6dvclv3r32vdth3p7/86892684095.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/pigumaxad.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/35848818917.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16085bed3587ce---5777291695.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/98016916172.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/1d8912c5c86060648e43d4ef16dd9757/27701975603.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/ledorad.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/nisemotosigo.pdfIn PDF document text
    • https://windscrm.net/files/file/kifezaj.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d63f585e8f---gikularokidamimexowurame.pdfIn PDF document text
    • https://basisangka.com/contents/files/bezigegabawuxefemawi.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/2535583558.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/e37374af58f12a17ea68f9a30fe1f663/fibibijoviserur.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/e83a009ef8cecb7a0a98088466bffb86/pegotimerokapusibe.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_off0000da96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA96 17480 bytes
SHA-256: a95a465972c2d23599d34cc1071c92580fd6583c71459ecb12fdd0204bdd9cb4
font_01_sfnt_off000107f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12010 10568 bytes
SHA-256: efcd98ffa8897ae79c126dbd5390506d05769e1fd9aa7c883fae58fc43eff558

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