Malicious PDF — malware analysis report

Static analysis result for SHA-256 5903ded6e0c87433…

MALICIOUS

PDF

77.0 KB Created: 2021-09-03 19:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 519828a8e8b136830f245c8b7ce5b557 SHA-1: 04109fa18060f6255b36f067b6b9bafaf90dc08f SHA-256: 5903ded6e0c87433843c61319b31598a5c283033e7e81d4e6b68b90f4cf57ea9
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of 'LOLBin token sequence in document text' heuristic further supports the malicious nature by indicating attempts to disguise malicious URLs within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://charmingcurls.se/upload/file/lifidagase.pdf In PDF document text
    • http://chaukitchen.com/uploads/files/dozozux.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/61644945554.pdfIn macro / runtime command snippet
    • http://kardelendalgicpompa.com/uploadfiles/file/gowufudinagoberudonidorar.pdfIn macro / runtime command snippet
    • http://asfalon.com/__files/file/51073292851.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/2j3ul35kccu6gsh42l061ovn84/burifugubojifusubutabivi.pdfIn PDF document text
    • https://iwistw.com/upload/files/tokinitukuz.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/15814949140.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7988f56785---24646316990.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925eb018c9f---kamepaxojopetipo.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/dodedikadagosazarovurevu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a72bdfddcd2---tazako.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/88747118047.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872e1769bf3---4071750794.pdfIn PDF document text
    • http://epicridesnepal.com/files/difejidoronedizuwagejan.pdfIn PDF document text
    • https://vitanov.rs/files/51669196270.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/12697345160.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/1d83e4695fab600aeebea158426399bf/wajezive.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/nizanikobipozesi.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b2cfb6501---1034757592.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/fubowituxofu.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/48362776865.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/basura.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a723556a3---pawonozoliwixuxo.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/38986437499.pdfIn PDF document text
    • http://chaukitchen.com/uIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=free+short+vowel+worksheets+3rd+gradePDF 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_off0000ca9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9E 16724 bytes
SHA-256: b8698957e5311cf7acfd640d1d871557f9e15bb589c37dcaec60edaa925dad57
font_01_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 10724 bytes
SHA-256: 0ea08af72b65ccfbb6feafa1a43e81b4a8f48455cfd840684ccee656e7618c63
font_02_sfnt_off00010e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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