Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be705b01b11c203…

MALICIOUS

PDF

87.2 KB Created: 2021-09-06 08:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4fc4ca5685f7597cc3a0dd2a648cec0a SHA-1: 23aee22bddf488a5ecc2ac34e1bde3ef56ec8a78 SHA-256: 5be705b01b11c203a6af476b911ae56c3666924bb6265d49f94a5031afc8476e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to PDFs hosted on compromised WordPress sites. This suggests the document is designed to lure users to malicious content, potentially for phishing or further malware delivery. The ML classifier strongly indicated maliciousness, and the structure aligns with a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://oniceh.ru/uplcv?utm_term=deutsch+lernen+mit+geschichte+pdf PDF link annotation
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/51508db0676ddbaa4ee725ae7b1fd8a2/54101328643.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/jagolitawojopagujepuro.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b2fec9868b---muwufisikosopabotupadog.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e45eac438f---2486445951.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/1af5fe264d417aba3fd30295d5b7c301/87969967930.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ed1220b95---22088387448.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8798cbef63---98292508184.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc73350ac9---15333217094.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ikhbqe0ju3t9v0eman51ddjop3/zutimiroxatiforugine.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/87478532163.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610f7a30e02b5---powebojodarijotore.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/0acedbd9d0df0e6442626444c3f74fbc/xumidekuvulukit.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ec481a74f---safodom.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160947cdb2e271---konifitobefebu.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/49622693582.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/tue0nqk59d3f31s2m9knhb8lnv/nojojoxiwipelexudi.pdfIn PDF document text
    • http://waypl.pl/upload/File/rafogotetagakukoxoduge.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/j8v9voom64kfdjb7phhvvlcbi1/18765870634.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/b61a56f0e1fd9744f7e7e04346a0c9f2/gonan.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/woxatutur.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/linipo.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac134ae0fbb---jowekatumise.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160783d5364daa---96038539140.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 2296 bytes
SHA-256: 21942acb00b1b514ad7f6c1de23740500cf86f1f6083a7317ef64fa8985817cc
font_01_sfnt_off0000ea2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 10888 bytes
SHA-256: 685289357c50d79b5fd84f5921d6037ac8af61efc6c267cfe95414dacf1d7181
font_03_sfnt_off00011b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0D 20208 bytes
SHA-256: 92b5b77b16d684515daedf598645f9cf430318f2898eb15a5976eeb9019dd0b5

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