Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bb9f3ad6024041…

MALICIOUS

PDF

101.3 KB Created: 2021-07-06 06:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b45bbeb2f420a2a18ea69d0f6e602043 SHA-1: 9e594bef1927705dc9dc2c002db339a72d7d3945 SHA-256: 88bb9f3ad6024041b926f1f8c2722c5c5f8eb35144fc5ccdc449586095d325fe
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest the document is designed to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1cf0125c6---dobafaxiboruguboxuxu.pdf In PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ercq5253nnm46dndrrgkg80062/nubedegavizuwetixisat.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/tenen.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/1568094020.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e6a53d30f26b16e657c89f56aaad546d/lubivibokunox.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/tasuxokupemamojuxunutoso.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d155243d06---sagewox.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/goxexibomavufurose.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/daziworujulejidapilibobej.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607435e07b4e7---7439729875.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f9fcd4010---53436457804.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/5f27aa8904aa1ea21128eb4eeebb5dd7/zusesifusofo.pdfIn PDF document text
    • https://drsaman.com/files/wiresefimexekobipod.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b30da537f95---vemenekezawufet.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/119970426.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/labovimimisubelujojolilex.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/743db6eb42a92bd2c1adda75c069fcf0/melesolelifojijibul.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84072ed8c7---peratewepimagilakomerik.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f26109ad7---kegebisazewijo.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/3206700290.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/84f08b686431b6829bb85a85411f1dda/zevaburisuxudat.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e17fdc2722---41516176059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=difference+between+pope+and+antipopePDF 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_off00012c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C00 16932 bytes
SHA-256: e83e60ec12d451a725ba678120975ef80bbacfecad987a38c106332031733a44
font_01_sfnt_off0001578e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1578E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FA5 10628 bytes
SHA-256: 2605b3c006d07de0dac44db6bd8f301aca2c55f4ef188e735bef3d3306e67dba