Malicious PDF — malware analysis report

Static analysis result for SHA-256 888900e26a2322b1…

MALICIOUS

PDF

73.7 KB Created: 2021-09-08 04:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9dc94efcb9169295721f9b35e28239b SHA-1: dcbd3898a0f583ae783223043c186b8f622595d3 SHA-256: 888900e26a2322b1de7c4c00f8baf9be7ddd7d1e73adbb5a2a2a5c32584801c2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://hanomanberjaya.com/contents//files/xevuniwufivifefawufobigo.pdf In PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160d20aeaef1bb---7615949921.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/babaruzu.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/0u7etkjh0ghnhc7s10r0qnh1sg/81292260486.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/34848319678.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/q5dphspivg7jsb2uumht6mq65j/tuviwabexagosud.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e393a6a732---ruwubajel.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/xijerifukabuxezonewevaki.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d01ca93892e---lojokumabifipomusizamavuk.pdfIn PDF document text
    • http://metabolit.ru/files/file/63023375019.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/57846786449.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f5179fc06---sedalizizupagafibefiri.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/35241255179.pdfIn PDF document text
    • http://artospace.com/pics/file/nakexiguwotujazuxufos.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/488ef5cd8a1347e9f7a5950f9be56d4b/85022038444.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/mimovobewakinima.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607009c164dfa---pefafekesup.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/42115490710.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/32808067202.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5d5d857b2---gogugonafinixezaxofixav.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/gifibuxam.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/18005363295.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d777be5e33---gelovujidimiduxotupebovi.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210624_396A3FE08984B7C7.pdfIn PDF document text
    • http://usateatop.com/_upload/files/78970191152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ccie+routing+and+switching+v5+0+official+cert+guide+pdfPDF 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_off0000baaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAF 16948 bytes
SHA-256: 847ea4c4aacc83586586b5295f0e990cb190a241e93352c20792c25f60325d3d
font_01_sfnt_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3A 11436 bytes
SHA-256: ed1e4c1fc3e7f16f33041d938e2eba843f1a06cf228991f90c974981ca03c9b2

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