Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d0a880447191230…

MALICIOUS

PDF

85.6 KB Created: 2021-09-06 15:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 00383543793c553b7c3b9267774b16d7 SHA-1: bc884cc6c50a75e3256b5a81ad2bc313b404fffb SHA-256: 3d0a880447191230dc6432de61b8d0be4d8b818350f8631de772e472fe985cbb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to manipulate search engine rankings or distribute further malicious content. No scripts were extracted, but the presence of multiple external links indicates a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/624e6jgotc4kdm0fm29ds48367/18072252388.pdf In PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/44722534855.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/854e57dd9fd74854b70d566c8aaaafd6/febegipofuzomovalexug.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cc6187a182---19382158225.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/fesikifuzomemupujuwiji.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210627024840.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/64281150784.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dbd7267de---82286742528.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/23814014714.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/60253522330.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/sleqbt4cke4oelc2sqfu3nfn9g/jofomeleteg.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/22380213868.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/u9u00ej9vfupg1u3jji3in8i64/sizisokanesisewiv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9fca927fe---bapewawusesukezefuzof.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/43047160531.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/wuzozuvite.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/zesubekorogukud.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a3c66e1e5---93378233343.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/31651689866.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/8f3068ce530d25c47f768b40f537e116/jukirovotuduguvovilega.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/79766016000.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/mepawawibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ansys+apdl+command+manualPDF 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_off0000ea44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA44 17940 bytes
SHA-256: 96803d47da6425e2e6bd1a9fd0c82820fa2726a28abf4e4b7e2f9115f7a876a5
font_01_sfnt_off0001194e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194E 10448 bytes
SHA-256: 35eb615313296102b55109809c8c9fa83d4e4324428528c63bb505d20fbc3cdb
font_02_sfnt_off00013107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1