Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ba6c3e6deb2dd6…

MALICIOUS

PDF

84.8 KB Created: 2021-09-08 05:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4552aaa04ee2694725dab6d820e9da16 SHA-1: 399f4262e07e1c09ae1a6131dfac1f09a01b98d0 SHA-256: b4ba6c3e6deb2dd6fbe16f751fd7822a517b42dd64de865db2bd2fd63589589c
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier strongly indicates maliciousness. The primary function appears to be redirecting users to potentially malicious or SEO-abused content, rather than executing code directly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://liveisagenix.com/ckfinder/userfiles/files/balar.pdf In PDF document text
    • https://eternalbliss.net/file/50979293828.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/sabenojobotolikijewiru.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/39d9b9e6c9f7c590a48593f75c509c89/gakogoke.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c926a1cbea1---1946875136.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/62975431993.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/bazamevijeravap.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c327556628b---genogijoxivudafajuzuze.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/21501845553.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/977862dbe8cd803833d27c18b8f70a0b/fujozula.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/02865220722a0332ae226486b7f0fcaf/lurudakibamebowetuwajaxum.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071db52846ae---59738918105.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edd27e7644---zuranovuxigaxovetisit.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/vowadiroj.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/27333790391.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/gp5kuj9prnmhdlv8p39jej7ob5/51210707205.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a47f122cd---12574083528.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/65918338737.pdfIn PDF document text
    • https://abeess.com/userfiles/file/40160071269.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/73958847676.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/fufazomasuligigiverime.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160713f5ded73c---1166675538.pdfIn PDF document text
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/43662419645.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/goq940s4je4427cr5s44i641ou/rezuwimapomofadelas.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/57152799665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=hist%C3%B3ria+intelectual+do+liberalismo+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_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 19988 bytes
SHA-256: f7472f43b72059bf29d9da2b21056188c552f0d92243570094483617bade5d82
font_01_sfnt_off00011118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001292f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292F 11152 bytes
SHA-256: d56b68e527301d9ac1aab8ce678d28c31de6b909fafc336f5ea15e95e4c099f1