Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a501a8298dd09b…

MALICIOUS

PDF

72.5 KB Created: 2021-05-13 04:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1156405bfc30a872e51cf08bb9ba4733 SHA-1: 8c37f03711107007c9029c849d2fb7a706932da7 SHA-256: 91a501a8298dd09bb86ff2e580c99a0281a68cc3b721ab6069708c4db7aca069
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of links pointing to compromised WordPress sites, indicating it functions as a link farm for malicious purposes. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 5

  • 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
  • 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://oniceh.ru/uplcv?utm_term=que+es+el+riesgo+laboral+pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10d0e55ba---94549100973.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3ce523a5c340d51f0482d5c88bf9eab9/vajidubefa.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/cc1e00ca7b2d5805f01f41bf27583900/67415410882.pdf
    • https://circolodelpistone.ch/userfiles/file/labokonafisexisexu.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/41df3a26f9ff1b81419855d4777455d5/93066811932.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160869540d5a04---rawaka.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/u8anum8tvkhfr3rbh42r38e1v6/96718364149.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607391ec30f04---27857608779.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/372ev3rnh8fu676d55d0i6r4gt/bigefemiwiranilese.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aadf1ed519---34561766855.pdf
    • http://auxerretv.com/content/public/file/75209826367.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/io7tl4juarp1n7hdcvhqcgpua6/88420657942.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/7056386008cc262688b1a7c8a7f5d500/rivuwavimowofifefoxaruwar.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/392e4h76hva4mava5m3qae7lm0/nawuxizelusavekadub.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d64e2ae436---munuguwomebowudi.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b72e6ebdc5---nurapivinuxedabove.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606da3ac48565---38042475972.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/96520965f80dd186c7488dea5eec771a/zifenu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dedb.bin
1e65338f2cc46ad63531ec6b0babc07241326cdd9e3d2bd52a5f3d0d79b8c7d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 5108 bytes
font_01_sfnt_off0000f03e.bin
b6fc5b0dcac8bd5a39ffe8fd63e82facb720f8bcb07b2e2b703a55dd4329557d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 11484 bytes
font_02_sfnt_off00011597.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11597 4324 bytes

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