Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f93b59a75264a5…

MALICIOUS

PDF

82.0 KB Created: 2021-08-17 10:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e5b3ac6d480548514ba1b4a6e9749308 SHA-1: 38bf2fc58694f9d24aeb1ac7bcd57bdb878ee01c SHA-256: d4f93b59a75264a50f1693ac1e0c290234ac9f35e722e24881da1e715b83ca03
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a tactic to distribute or obscure malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and embedded URLs suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ad412dac52e---75424972689.pdf In PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/kulufenuw.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/79eb0a522055a3dd097ab8a99555a130/mesurugedeserunu.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/7046184323.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/wifitekivin.pdfIn PDF document text
    • http://abnicum.com/files/file/sotexikixid.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ccnrvugvp8r35ef5sasbtvjkb5/65561258055.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/poniwilogi.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/9fb5c73026dadf5a7f1daffd88898227/tomomawifenizuk.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/74178590014.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/52081193704.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/irja4p89q9426vtrb3rnfplc14/24414332969.pdfIn PDF document text
    • http://jump360.co/upload/files/20210726232221.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160fd180ca583d---popolepawakudibuxavakipif.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/59c102ecd500ff37042ada9eba75c0b9/begukivabupolumuwijusuja.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/a2eb61aed013b463be8a5904a778b266/22404986296.pdfIn PDF document text
    • https://bczenekar.hu/files/file/napulasibarupovepo.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ddad50ea---mujusanudabov.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/064ac81c2e0e7c1a01c12f9d622b7dbe/76973684514.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160953bf798900---92884589420.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/kn611hkpmt4frk2o7n4co16080/87974870821.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/524587284.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dosuvuvebe.pdfIn PDF document text
    • http://firegallery.ru/img/upload/7942426302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+winter+caladium+bulbsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD2 17568 bytes
SHA-256: 69e73ca103f16050b9db5af37aeaab069895dc9c8e352a003f6c890969e76c87
font_01_sfnt_off0000fd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD72 10848 bytes
SHA-256: 6bff0059b89506fd60f1ada862126729b44f1d54ef11441e4a5f0cbbb3a6f302
font_02_sfnt_off00011673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11673 2328 bytes
SHA-256: 97ec669d954d95f7f11ed1d7b8736228109f07c966ab3d6524b1aa4964609446
font_03_sfnt_off000120ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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