Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0d89ae3194ec371…

MALICIOUS

PDF

87.1 KB Created: 2021-06-30 13:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2a4db7e16a5160473daa393fbddd263 SHA-1: 0bb86d9a1d39412114f4d05883c69a330781363e SHA-256: d0d89ae3194ec37161b99487358c52ce6f7a9d75ae0253cefb4f9e55df50064e
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 WordPress sites, a common technique for distributing malware or phishing lures. The ML classifier strongly indicated maliciousness, and the presence of numerous external links on disposable or compromised hosting supports this assessment. No scripts were extracted, but the structure suggests the PDF's primary purpose is to act as a redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/s3pmeal6p75iiiu8r783c40ers/vizasusedofuz.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160724a4528092---pumorewusudibupejovadatu.pdf
    • https://la-klamm.org/userfiles/file/fezamatuvi.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/9e3c6d559282cb044c26a8e29f06c9e4/30619202531.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/39800028292.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/hpjggqhlgm2ss66hokem9vqns1/8099899790.pdf
    • http://hzjksj.com/images/upload/File/14780395489.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac59eec8fbf---pajutojewibapeposutu.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740e7778a6d---2398078643.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/96dd62cbeabb18dc99982be744991bfc/voviw.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/91779208531.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a035266d706---8340461981.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c746c120f10---52374804588.pdf
    • http://artpolinakuzina.ru/pict/file/ledebexixabofogiwuzi.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c20b4c3ed---daxade.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acc0a8c5442---banoketekomukub.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607875686454a---texukufonijuwunizirikup.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/2db2405c1cdaf27cf59260e09d6ebf22/49461134641.pdf
    • https://go2germany.ru/files/file/xegaditupa.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/e8cbf5345e1e5a47248c984c3e206812/35223447345.pdf
    • https://sgcaregiver.org/contents/files/sesekolojukipunumetoxeba.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/q7ercfnne512b9p52l1vd9haug/4962133782.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/5jhir24476aocl7iql77s7da24/jimepisulewapud.pdf
    • http://bienbao.org/uploads/files/48057995592.pdf
    • http://www.lugashotel.com/data/editorfile/93826689887.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+flintstones+the+engagement+ring
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ef.bin
49145ab30b2f284479462aa93fc40a829767ec17680c49cc9d8e033037ecbb41
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 17628 bytes
font_01_sfnt_off00011ee5.bin
30f835337dc2f6e57a93debb39169f5970dcabbc4c3611c0c8612b8e2feaab63
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE5 10624 bytes
font_02_sfnt_off00013706.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13706 16792 bytes