Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a90d093833cbf65…

MALICIOUS

PDF

91.3 KB Created: 2021-06-26 20:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ab39d827b57f614722380207acf43ffb SHA-1: c7220fce44dbed50cff6f2a2727d8b17f6eba007 SHA-256: 8a90d093833cbf6589e3818d89664e2f5c46c288c80aec86bfcfd3bd63d730a9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs, many of which point to compromised WordPress installations. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the presence of external URIs and link farms on disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a6d2f449a9c566f3684895e12fd2dcc2/zezobejiximoromebadov.pdf In PDF document text
    • http://eden.pk/mycms/uploadedimages/editorUploadedImages/file/movaso.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/83978837178.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/sobegafuwutodiref.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/i1nksdiknnetfihqi5vr6evorf/wesimijobekogufuvus.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1a67d2b15---xukin.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab28f2d2255---84777980363.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8572b8025---37574710174.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bbe0e316f---piwokojixezinov.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7458d951b7---jipim.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d0a4823ca---69743168935.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/02ff8cc2b1c8a35dfa4a4993208804b7/98681375223.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/sotaxedol.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ii00budog5lma55vmfi0tkvqo6/34049319316.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2d80b8fd3ed2aa62f04bd7b597bb466e/10744498455.pdfIn PDF document text
    • http://premium-h.info/files/files/xodemunapirowewukunebit.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e8ca6f133---46167975746.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/wefanidupali.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/hht11qh5nh0piob3b6igemmscm/88085083210.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/um06dkj2eoh999blooi06uvb4o/notanomobex.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607ec0dd01036---85796643995.pdfIn PDF document text
    • https://tonitomov.com/picture/file/zovogulopakasakulisinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=2+sons+bistroPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 16340 bytes
SHA-256: 88a5f3ad9079b2340172ecd64f1cd79ba1ad1753eb2b73e58de10c5a7be67d15
font_01_sfnt_off0001035e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B70 17896 bytes
SHA-256: f6ea49b741d01eb74c07be7049d676333b3445f64d2e2a0cd29d33f2f8c7fcb7
font_03_sfnt_off000149e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E6 9924 bytes
SHA-256: b133507d417d7bc9472c260d7e59a8fcb8a46fc7f4a406f5a6ea84e97f06a3eb

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