Malicious PDF — malware analysis report

Static analysis result for SHA-256 408802633bf9b996…

MALICIOUS

PDF

86.7 KB Created: 2021-06-25 19:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 28e641f0c9dcafc9f289dba3540247ce SHA-1: 25876de0b8b9a0b7bce70d619f2d054065d47a3b SHA-256: 408802633bf9b9969e5dd1d40c1bc18d89c2aeaaeac9d1f516fb11c583ae552a
96 Risk Score

Malware Insights

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

The PDF file contains a link farm that redirects to multiple distinct hosts, many of which appear to be compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this is a common technique for distributing malware or phishing content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ea67da84e4a907da76a5e79153c1bdfd/rukozawoxuvugir.pdf In PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/3695c33d8ad87b1617a9085afca48906/xunibemutuvev.pdfIn PDF document text
    • http://garderoba.sk/images/_file/39022306698.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/5262479ca50a1f11d0418b2dd02086b0/45177497459.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/lepun.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/85449609754.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a20fdac532e851c74e33cba53eaa0ee1/voxuzege.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/9b01f99d08a824991670b873d0e658d5/96220475672.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096eb85a6258---nobuzanobewanatuvewa.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16099bb7fe7c89---jafoze.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/p8of30bb30ni2pkslek5d75ac4/modavugitinobovebuvo.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/23d9a79e217e28235d98f2a52936a03f/14121477864.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/6un0rim5t70b5qqq14ql76egjl/75240854611.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/nitenibusod.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dd8a646e5---53203774626.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076e00ea460c---12530388573.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/48020327746.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/93992552730.pdfIn PDF document text
    • https://sealskinz.ru/files/file/sawirumoruwetorubi.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/cedf7233dcdda26bc9c72bef48cda3c8/59775866137.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b54cc7c52b4---zekivedapemanevapowukip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=from+follow+the+rabbit+proof+fence+comprehension+check+answersPDF 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_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 11040 bytes
SHA-256: f0de90e8facf79a2304e872de6be030c33c4d4b37c08c703604723418b546345
font_02_sfnt_off000120d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D9 17180 bytes
SHA-256: f4b99f257ef2b27300ab12828e114b1c1502ea5f2cac4a2f45f946e1e8ee1b9f

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