Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f89ff500e0e6b37…

MALICIOUS

PDF

83.4 KB Created: 2021-07-13 17:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ba029ef8fe7659d9ec9334973a9a69c SHA-1: 96806f80bee12376976d8c828dbb9217019e6bd3 SHA-256: 5f89ff500e0e6b370179923e516a2445b57fa89a2c4c26acf0ff91fb2019b2f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a large number of links, many pointing to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to lure users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d8db17d2dae---pubanutizokegomeja.pdf
    • http://bright-mineral.com/uploadfile/file/2021061710512569.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b177a00e---5048501601.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16085794190014---43555220205.pdf
    • http://seanmore.com/userData/board/file/jojiroxuzadulevifesimaz.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/93072738ae007703a0c811f92279550e/wafubexubajer.pdf
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/pazakamojol.pdf
    • http://cafemsoffice.com/userfiles/files/34949831666.pdf
    • http://kopdesign.nl/userfiles/file/nopigem.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/07f71b4358bef725a1472f0a1bd4d9e6/58961656824.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/77702191dba88f1c762775c5a2b8a518/gupusanakixatajisa.pdf
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/22037906488.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094de3fb845d---goriwewonut.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/917b59eac16e4cfeb8bfd779ac8a1339/43721505335.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ea7d667068aa92d3359a6e4a8e35193c/budolet.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe3a29a486---99696269146.pdf
    • http://akinmedikal.com/uploads/file/sigixadoxavugifuser.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f157545fa1587841b1da2355f05fe94a/gojeso.pdf
    • http://choinka4x4.org/cms/files/file/95775685364.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e43bcf2ce9---68718658774.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=polar+heart+rate+monitor+manual+ft4
    • 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_off0000e442.bin
4bca8f31040c8ad09200736ee81bf7a3d4a88c19fe32c4057071116af772afaa
pdf-font-stream PDF embedded font (sfnt) at offset 0xE442 10492 bytes
font_01_sfnt_off0000fbef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEF 16792 bytes
font_02_sfnt_off00011401.bin
ea11af27003109402ec990781a5491e2a39430c4cc991b79c4c0485d94a387a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11401 16984 bytes